how to fill large hole in an internal wall
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- เผยแพร่เมื่อ 21 ส.ค. 2024
- how to fill large hole in an internal wall using a core which was cut out from a thermolite block, using a core drill. The hole in this wall was particularly large, as it was where a vent had been removed, so the hole was about 6 inches in diameter. A core was cut from a thermolite (aerated concrete block) and this was used to fill the hole, before the top surface was filled. I have done similar videos in the past, which might help people-
Gyproc Easi-fill- • Gyproc Easi-fill | Gyp...
Repair a crack in plaster- • How to repair a crack ...
Plaster a wall or fill and sand- • Plaster a wall or fill...
How to use a core drill- • How to use a diamond c...
Repair minor wall damage- • How to repair minor da... - แนวปฏิบัติและการใช้ชีวิต
Love easifill 20 but like plaster is it very sensitive to ageing, older stuff sets really quickly, sometimes before you get to the wall.
For others out there who might be using it on a large hole, as you mentioned a trowel works really well for getting a smooth finish. I keep working it while it is starting to go off, spritz it with a little bit of water and you can float it off like plaster and then you only need minimal sanding.
The same technique works great if you are feathering in a large shallow area but be very gentle as it's easy to pull it off the wall as it hardens up.
Yeah, that Easi-fill is a few years old and went off really quickly!
Thanks for the comment 👍
@@ultimatehandyman Haha, yeah I thought that might be the case. I tried to use some that was about 3 years old, it went hard before I even got it fully mixed.
@caskwith I think this was from 2015 when I renovated a flat for the girlfriends mum, I'm not throwing it though, as you have to buy a large bag if I remember rightly. Gyproc did start making it ready mixed for repair work, I think it was called Easi-filler. Next time I use it, I'll make sure I'm closer to the job and add more water 😂
If you ever consider using a thermolite block that has been outside for a couple of years- DON’T DO IT! I used this one to save me an hour round journey to get a new block from B&Q, but because of it, I had to wait a few days for the filler to harden!
I hope everyone has a great Sunday 😉
What about popping it in the oven for a bit before use?
I recently bought a house and much because of you I've been able to tackle a lot of the DIY tasks with a lot of confidence. Thanks for the great videos through the years! Greetings from Norway.
I'm glad the videos have helped 😉
Thanks for the comment 👍
I had to do a similar job not so long ago when I had a new boiler installed, I asked the plumber to save me the core he took out for the new vent pipe, he couldn't think why then when he explained he said what a good idea it was as I was doing it on an old building with (proper) bricks.
I found putting the pilot hole drill bit back in the core when positioning the core helped as it gives you something to hold and allows you to position the core much easier once it is inserted in the hole and then you just slip out the pilot drill bit once in place.
Also rather than use silicone I used a roughneck pointing gun to squirt in some mortar around the core having placed the core on a few plastic spacers. When drilling the core on your patio I would have put an offcut of wood under it just in case when you broke through you caught the pavers. Unlikely to happen but not worth the risk when easily avoided.
I set my core in a bit and put a layer of cement over it to match what was done on the rest of the wall then a skim of Pollyfill once it had all gone off. When doing the skimming I always find you get a better finish and avoid catching/dragging the filler if you dip the filling knife/plaserting trowel in water before each pass and clean it off after each pass, or use a paint brush dipped in water rather than dipping the whole knife.
As ever, a good video that shows something that will help many people and maybe some of my tips might help others doing a similar job in the future.
That's a good idea about using the hole in the core to position it, but I normally remove the drill bit once the hole is started to lessen the chance of it grabbing. Thanks for sharing your tips and Thanks for the comment 👍
@@ultimatehandyman Yes, I would always remove the drill bit as per the instruction which usually state to remove it once the is started. What I meant was just to put it back in the hole while positioning the core in the wall, could use a smaller bit or some dowel. You may not be able to put it all the way into the core but you could drill right through with the pilot bit or an SDS bit if you wanted to be able to put something right through the hole.
Once the core is in the wall it can be hard to reposition it if needed as there is nothing to grab hold of and with the weight of it it is hard to move. But putting something in the pilot hole can help a lot.
Look forward to the video of doing the outside in the Spring when it is a bit nicer outside!
Hopefully, we will get a couple of dry days next year. I can't believe that 2018 was one of the dryest years on record and this year has been a washout!
Thanks again for the comment ;-)
I’ve had to do this sort of job before. I don’t have any core drills (although I could certainly do with one) so I just cut a hexagonal shaped piece of block and bedded it in with mortar.
Not trying to slate this method, but not everybody has a core drill laying around or can justify buying one for a one time use.
And for those of you that don’t know (I hope this doesn’t seem patronising), you can very easily cut through thermalite blocks using a normal handsaw. No fancy or expensive cutting equipment needed.
I meant to show how to cut the block with a saw, but forgot about it.
Thanks for the comment 👍
Crikey, from the thumbnail with you in it the hole looked much bigger! Like something out of the Brent Cross robbery. 🤣😂🤣
😂
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We drill alot of cores for vents and flues anyway. I keep a few in my garage for this reason. I usually rapid cement them into place but its a tried and tested method however you go about it!
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You took the trouble to do the job right. Many wouldn't have bothered to cut out a block and fill the hole like that. Thanks for this. 👍
You are welcome
Thanks for the comment 👍
Fill fix foam then the plaster. A lot easier and quicker. And it does a good job. For those of us who havnt got a drill bit.👍👍👍
Absolutely 😉
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You mentioned spray foam to seal the core into the hole, i think that would have been the go. Love the cup of tea... now that is the go !! Great videos thank you.
I made that cup of tea, expecting the filler to go off in half an hour or so 😂
I was going to go to the next town to buy a new block, but realised I had one in the garden, which was outside for a couple of years. It took days for the filler to dry out 😂
I would have used expanding foam, but because I only use it once in a blue moon, it is too much hassle cleaning the gun after use!
Thanks for the comment 👍
@@ultimatehandyman you leave the foam on the gun and just spray and wipe the nozzle after you've locked off the adjustment screw. How will you manage to make good the outside?
I fit plenty of boilers. I've never thought of keeping the sectional core waste. Maybe I will keep a few from now on. Great tip pal 👏👍
I did the same thing recently to a tumble dryer hole but used slices of brick and mortar. Much harder than cutting the core to use as a plug, I didn’t think of that! Cheers for the video as always Chez and I hope you are well and back to normal 👍👍👍
You are welcome.
I'm absolutely fine, thanks for asking 😉
Thanks for the comment 👍
Much harder maybe, but not if you don't already have a drill, core cutter and a thermolite block?
This guy is the best.
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Great video thanks.......from the thumbnail I thought the hole was about 2ft diameter lol
LOL 😂
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very satisfying.
👍
That looks like an portable aircon hose outlet. I use a thermalite core, the same as yourself, but wedge it in place & then use filler foam all round. If the blocks wet, all the better because the foam cures quicker when damp. Just cut it back & plaster as normal. Happy days. 😃😃👍👍
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Great part number for an SDS when it starts with GBH, sounds like it means business lol
Yeah, I love that drill. I must have had it for 20 years!
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You left it out in the sun to dry, when was there sun and can West Yorkshire have some please?
The sun was not there for long and it was not warm, to be honest 😉
I think we will all need vitamin D supplements this year, as it has rained almost every day!
Thanks for the comment 👍
If you haven't got a block you can just fill with expanding foam and cut a plasterboard plug, a nice wide blade, wider than the hole and you can get it really tidy in less passes, before sanding always think can I use a damp cloth instead, if there's not much to take off a damp cloth rubs it off and leaves no scratches or dust, this is especially useful when working on ceilings ;)
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That's how I whould have done it as it's time saving and I haven't.invesyed in a core drill bit
I had a big hole or gap at the side of a window that was hidden and the window sill was loose. All I did was take a handful of pre mixed tile adhesive and just stuffed it into the gap, though I could not see what I was doing I could feel it. Job done, even the sill on the other side seemed better supported.
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Let me get this straight......in your big container that would normally contain an edible white protein powder - you have put another white powder of similar consistency that's lethally toxic and will turn your insides into a wall! :D
You could probably use protein powder as filler 😂
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heres a tip what ever direction you put the filler on(left to right for instance) smooth and remove the opposite direction you dont drag it out and get a better finish
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5:11 Damn i didin't know protein powder was this good 😂🚀🍻
😂😂😂
Great video and love the many ideas and suggestions in the comments. The part about the trowel in the loft rings true to me.
I have three Artexing brushes and at least five silicone guns, as I keep putting them away 😂
Sometimes it is just easier to buy a new one than look for my existing one!
Thanks for the comment 👍
Brilliant and very clear. But how did you fix the external side of the hole?
I'll probably remove the vent from outside and either fill the vent and replace it, ot replace a couple of the bricks (when it's nicer weather)
Thanks for the comment 👍
Ultimate Handyman
I was just about to ask the same question 👍
Ditto, great video as always.
PVA all the area, then use platerboard and expanding foam (use the hard drying expanding foam). When its dry use bonding coat, then finish with filler. I mix PVA in the Bonding coat to have a stronger bond .
If you dont have a thermalite block lying around, what can you use as an alternative?
Nice. The thumbnail looked like something from the hatton garden heist 😂
I'm not guilty of making the thumbnail
😂
Thanks for the comment 👍
Very useful tips. I have a similar vent hole in my pantry wall that needs filling, although I don't have a core drill. I hope you can film the outside wall part - when the weather improves as you say :)
If you are ever passing Darwen, let me know and I'll cut you a core from the remainder of the block 😉
I'll try and film the outside fix, sometime next year.
Thanks for the comment 👍
Very kind, I'll bear it in mind! 👍
V.Good way to fill the hole , that filler looks to be really good.If you wasn't able to to get old of a core drill bit you could also just cut a square of block and knock the corners off not as tidy but would save on tools required for job.Good vid. 👍
Yes, the Easi-fill is superb. I did think about just cutting a block down to suit, but you are absolutely right.
Thanks for the comment 👍
Perfect timing Im going to be updating the bathroom shortly , Replacing the bath with an offset shower enclosure . Which also means having to move the toilet . So Ive been thinking how Im going to fill the hole left behind Now I know . Also can you tell me where you get the large hole cutters from as I`ll need one to cut a fresh hole for the toilet .. Thanks .....
I bought a set from ebay a few years back, like this- fave.co/2OIsY8A
I also have a set of Silverline as well, but they are not as good as the Makita set
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Had that post without. Filled me right up. Boom tsss.
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Very good video, I have got the same 6inch hole to fill, so this has given me some ideas, I guess the best thing to do with the outside is to put a vent over the hole at least it will let some air into the cavity or did you brick it up with matching bricks.
It depends, in this house, there is loose-fill cavity wall insulation, so at some point, I will either fill the vent with expanding foam or remove it and replace a couple of the bricks (when it gets warmer)
Thanks for the comment 👍
Very useful as always, bet you wished you had gone up in the loft to get the trowel after all!
Every time I repair plaster, I always find that I end up using the wrong tool. A few years back I was renovating a flat for the girlfriend's mother and forgot the trowel and the wide filling knife, but it was quicker to struggle with the knife that I had instead of driving home to get the larger one.
This time my plastering trowel was in my garage loft (which means moving loads of stuff in the garage first), plus I used a block which had been outside for years and was so wet that it took a few days for the filler to dry out!
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Thank you sir for the many howers of tips
You are welcome
Thanks for the comment 👍
nice job, my mate has used the easyfill he said it was very easy to sand, guess if you pick the easyfill with the longer said time you could take you time abit more with the filling in of the hole.
Yes, it is the best filler that I have ever used. The Easi-fill 60 is probably the best bet
Thanks for the comment 👍
Solid video, always nice and clear how you approach tasks. Also honest about tools and materials needed.
Felt sorry for you at the end though with the filling knife, I was thinking grab the small plastering trowel!
Great stuff the Easi-fill 60, £13 for 5kg bag from Toolstation and always beats ready mixed no matter what all the brands say, been there done that - just get the water and mix what you need.
Thumbs up! watching from London
It would have been easier for me to go and buy a new trowel, than go into the loft to get my filling knife or plasterers trowel. I think this is why I end up with several identical tools. I have about 8 tape measures, five silicone guns and over 8 drills ;-)
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@@ultimatehandyman ha ha ha
ditto for the tape measures have about 5 different goodn's and 2 rusty ones for bad weather measuring.
Keep the content coming - you're channel easily stands out with the construction related channels I watch, yourself and Skillbuilder.
Hi I am a novice and thought I would state how I did it. I got a piece of thin wood that I cut and placed into the hole to create a wall sort of. Jammed it in a little. Then I got No Nonsense Expanding Foam from screwfix and sprayed that into the remaining area. Waited til it dried and cut out to get as flush as possible to wall, then polly filla rest and painted. I do not know if it was correct but hey its done :) Great Channel by the way.
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You should have put in a quote to fill the Hatton Park hole 😉
😂😂😂
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Hi I have just come across all of your videos and may I say a big thank you for sharing and producing all of these. The tips have been fantastic; where did you learn all of this you are a genius!
Glad you like them 👍
I've been doing DIY since I was a child 👍
Brilliant idea.
Best wishes
Pete.
Thanks for the comment Pete 👍
Great tips, I do enjoy your videos...
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I've never seen those thermolite blocks here in the US. If I was batching a hole in a concrete or concrete block wall, I would just mix up some concrete so that it was fairly thick and just put it in the hole, possibly with a board on the outer faces to hold it in there while it dried. Once it dried, I would come back with either some stucco or mortar mix for a topping coat to make it smooth. Different techniques for different countries, I guess...
Thermolite blocks are not my favourite to be honest, although they are really easy to work with. I'm not sure which countries use them.
Thanks for the comment
ever have that feeling when you had your bathroom done over a decade ago where they moved the air vent and you have no idea if they have just left a giant hole in your brickwork and theres been nothing more than a piece of tile thats been leaking heat out your house all these years?
looks like i've got another job to add to the list. hopefully that job is just "check there's not a giant hole in the wall".
Best of luck with it 👍
Great help. Great idea. Thank you !
Glad it was helpful! 👍
Neat job and great idea with the plug, beats packing it with papers etc
Thanks for the comment 👍
Excellent video as always, brilliant tips, must get a bag of that easy fill 20 to have in the shed. Keep up the brilliant work..
It's great for repairing plaster damage etc.
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@@ultimatehandyman Really love the way you explain and demonstrate things, I love DIY, Will put my hand to most things, plumbing ,sparks ,wood work, fixing and repairing but it's all self taught, Learning from the likes you and others (mainly off you tube). Every day is a learning day in book. Thanks again for all help and great Video's.
It's good that you are prepared to have a go at anything 👍
The internet has made it much easier now, I used to read DIY books LOL
Thanks for the comments ;-)
Looks very nice. How u seal out side by sliding? 👌👌👌 thanks for sharing.
easyfill makes and speed up the job enjoyed the video happy Sunday 😁
Yes, it is brilliant stuff.
Happy Sunday to you too
Thanks for the comment 👍
Great video buddy,,would you recommend this filler for where I’ve ripped of the old daydo rail around the bedroom,,,,,also what video editing software do you use because I’ve started a TH-cam channel and want to make some good drone videos 👍👍👍
Yes, Easi-fill is the best filler I have ever used. I've used this on walls that most people would have re-plastered- th-cam.com/video/6wa_m_RKWjw/w-d-xo.html
I used Adobe Premiere, but it is expensive now. I bought a legitimate copy from a seller on ebay for £500
Otherwise, you have to pay a subscription each month!
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Another good video mate, some good tips there!!
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Good video. Hopefully I won't be having to fill big holes in the wall anytime soon.
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Good video as always.
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Not sure the average DIYer will have this equipment!
You can always cut the thermolite block using a saw, they are very soft.
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I like your smile
Thanks ;-)
So helpful! What did you do to patch the exterior side?
I just left the vent on the other side, so it’s venting the cavity- until I get time to replace the bricks!
Thanks for the comment 👍
Great video. Thanks for sharing it. What did you do to cover the other side of the hole with? Is it best to seal it with insulation on the exterior side, using the glue putty and then covering it with a metal cover fused or closed permanently with screws and epoxy? I live northeast and have a huge kitchen exhaust. I would like to remove it, close the hole and use a ductless hood range fan instead, but I am still pondering if I should keep the exhaust fan and just buy a new clean one and forgo the ductless, because what worked beautifully for you might become hard for us to achieve due to the massive hole of our huge exhaust. It's a hard decision. We need an exhaust, but they look obtrusive and disrupt the esthetic presence of a what should be a new beautifying backsplash, when we replace it.
I would keep the vent to outside to be honest. Extractors that re-circulate the air often require a charcoal filer, which requires replacing regularly.
I did not cover the other side of the hole (on the external wall), it is venting the cavity for now but when I get chance I will replace one or two of the bricks.
Thanks for the comment
Your TH-cam picture to advertise this video made the hole look like it was really big like you would get from maybe drilling through the wall of a bank vault using a massive Hilti with drill assist
I'm not guilty of making the thumbnail 😂
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That core filled the first layer of cinderblock fine, but left the external brickwork and central cavity exposed to the elements, out of interest, what did you do with the external side of the hole? Brill idea core drilling will be using that one myself 😀👍
I'll replace a couple of bricks outside when I get time.
It's not taking any harm for now, as it is venting the cavity.
Quality job!
Thanks for the comment 👍
Great tips Thanks
You are welcome
Thanks for the comment 👍
Do you leave the cavity air gap or is the entire cavity filled with the block?
I left a gap so that only the internal wall is filled.
I'll sort the outside part of the vent next year, when the weather improves.
Thanks for the comment 👍
Great video
Thanks for the comment 👍
Hi mate quick idea- i just live in israel and here we have many concrete walls. You could mix mortar. And then fill the majority with pieces of stones or concrete block pieces... And its less tools and so on
Yes, you can do that, no problem at all
Thanks for the comment 👍
@@ultimatehandyman yea i believed so but actually wasnt entirely sure. If there might be problems over time with cracking due to differences between solid concrete and mixed mortar. But i guess its doable 👍😀
It should be fine, especially if you paint the hole first with some SBR, or just soak it wet through so that it does not dry out too quickly. It's a lot hotter where you live, so it will dry out really quickly and will crack if it is not wet first.
👍
@@ultimatehandyman yea thats true. I realized that watering an area makes a much better bond. Thanks for the info love your channel
Why not use concrete to fill the whole? More secure and will have longevity
🤔
Nice video but I would have used a spatula wider than the hole diameter :o))
Me too, I need to stop putting tools in my loft 😂
What about closing up the exterior and wall cavity? Will dampness get into the walls through that?
No, it will be fine. There is a vent on the outside of the property. I’ll remove the vent and replace with bricks when I get chance 👍
Title fail - "Ultimate Handyman fills his girlfriends hard to get at dry hole"
😂
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Badgers mate
I thought the Tories had shot them all 😂
Thanks for the video - very interesting. Did you already have the core cutter? If not, where did you buy it or hire it from? Or perhaps you borrowed it?
Yes, I have two sets of diamond core drills, but I don't use the other set much.
The Makita ones that I use now were on special offer at Screwfix a few years back.
Thanks for the comment 👍
Fill, girlfriend and hole in the same sentence fnar fnar 😉
😂😂
@Richie Wong and Finbar Saunders ... twins separated at birth?
viz.co.uk/category/finbarr-saunders/
Finbar Saunders 😂
Forbidden protein powder!
😂
Thanks
You are welcome
Thanks for the comment 👍
Neat job !
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Just the brickwork outside now
I'll get around to that one day 👍
Just thinking, would the block have dried in the oven for a while to help you out a bit?
Yes, that would probably have helped ;-)
Thanks for the comment 👍
Great idea Chaz .
Not seen that filler brand.
Question would you do the same on opposite with a house brick ?
No, on the outside I will probably either fill the vent using expanding foam or similar, but more than likely I will replace a couple of bricks when the weather improves.
Thanks for the comment 👍
A temporary handle on core would be good too.
Thanks for the comment 👍
We our currently renovating a house and where the rewire chasing has been done as damaged what is a breeze block wall resulting in a large hole where you can now seeing into the cavity. What would you advise as the best repair?
Jesus, how deep are the chases?
Normally I would just use Gyproc easi-fill- th-cam.com/video/iM_FD403--k/w-d-xo.html&t
Any suggestions on how to fill the hole where flue was? Currently have rook wool and a grill covering outside. Don’t want the hassle of removing bricks to fill it in. Thanks for the video
I'd replace the bricks to be honest, it's the only solution that will look right IMHO
Thanks for the comment 👍
@@ultimatehandyman Thanks for replying 👍🏼 will give it a go
Just one question, where did you find the Sun lol....
That was the last time I saw it and even then it was not warm 😂
Tidy! Now for the outside fill 🤔
I'll replace a couple of the bricks- next year 😉
Thanks for the comment 👍
Ultimate Handyman look forward for a video of the bricks 🧱 fitting
Next year? 😳 Sounds like one of my jobs 😝 ‘You only ever do half the job’ .... I can hear her now! 🤣🤣 Life would be boring if we didn’t have a list of jobs to do. 😊
Planning on sticking them in too? Mitre fast works well quick 😂😂😂
I'm curious what the hole looked like from the outside. Did that require filling as well?
Hi Jo, There is just a vent on the outside of the property. I'll either block that up or remove it and replace a couple of bricks when the weather improves next year
Thanks for the comment 👍
Can you do a video on soundproofing an internal wall please
No, sorry.
Soundproofing is not a simple job and to do it properly can cost a small fortune. I have had people complaining about noisy neighbours in the past and they think I'm joking when I tell them that it is easier to move (and probably less expensive) than effective sound proofing.
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Hello, hope you are keeping well! I agree, the GBH 4 DFE is very robust and reliable. Are you still using it? Have you ever done any maintenance/service on yours?
I'm great thanks 😉
That drill has to be my favourite drill of all time, it's superb. I've not done any maintenance at all on it, I just keep it clean and occasionally put a bit of silicone grease on a drill bit to keep the chuck lubricated.
Thanks for the comment 👍
@@ultimatehandyman My dad retired a few years ago and passed it on to me, we used it together on a few jobs and it's got a bit of sentimental value, even though some might think it's just a tool! Would eventually like to give it a refurb, although it's still running smooth as butter.
good stuff
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What grit paper did you use to sand ?
Damn, I missed putting that bit in the video 😱
I used 320 grade
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What can you use if your hole isn't a perfect circle? Many thanks in advance
You can fill it up with a few small pieces of brick/block etc and then hold it all in position with mortar or expanding foam etc. Then just fill it flush and sand afterwards
Thanks for the comment
Instead of using the block, could you have just filled the hole with expanding foam then used the filler? Cheers.
Yes, you could do. You would have to apply the foam so that it did not expand into the cavity though. It would probably be best to allow the foam to expand outwards, then cut it back with a hacksaw blade before wetting the area and then filling the hole.
Thanks for the comment 👍
I never like doing that. It’s a messy way to do it and the area will always be weak. I use mortar and brick pieces.
Thanks for the video 👍
You are welcome
Thanks for the comment 👍
Hi, thanks for the video, I need to do something like this soon, our walls are made of brick and then plaster, we are removing a very old electric heater that is mounted on the wall and has a vent behind it that goes right through to outside, would using a termolite block still be the best way, I was thinking of adding the block, using the sealant then covering the hole with british gypsum bonding 60 instead of the filla you use. Any advice much appreciated
Yeah, you can do it that way if you like. Basically I just used what I had lying around, you can fill the hole with bricks or similar and plaster over, if preferred 👍
@@ultimatehandyman thanks for the reply, i was also considering using the expanding foam and putting some plasterboard over it then using bonding and scrim tape, what do you think of that approach?
@@dannyhardy3295 Yeah, that should be fine (sorry for the late reply, TH-cam comments has been playing up AGAIN, So I have just seen this)
I hope you charged triple because they did not move the cabinet for you or at least lightened the load by removing the contents. Been there, done that as the contractor is always taken for granted. Like your channel though.
I'm afraid this is my own house, the cabinet is a fitted unit and is fixed to the wall.
Thanks for the comment 👍
Same idea for outside, just use plaster?
No, I'm just leaving outside for now, but at a later date I will replace a couple of the bricks.
If your house is rendered you can fill the hole and patch up the render using mortar (plaster should only be used internally)
Thanks for the comment 👍
is there insulation board between your brick and thermolite walls ? im in a newish build too from 2009 and i think its a " metal frame build with brick exterior " ( its a 3 story block of flats )
No, this house was built in the 1980's. It does have insulation though, but it is loose fill.
Thanks for the comment 👍
could you paint straight over that rather than paper ?
Yes, of course. Just prime it first either using a primer, such as Zinsser 123 or give it a mist coat first.
Thanks for the comment 👍
Can ypu fill a hole like this and then re-drill the same place but a little lower, cause the person that done ours has put the hole a little higher than the vent hole on the tumble dryer and we need it a tiny bit lower for a straight tube to go from tumble dryer to out of wall.
You can, but it is not easy.
You need to ensure that the block that you put in is fixed really firmly, but once it is fixed you should be able to pop a new hole slightly lower down. Once you get the hole started with the core drill, make sure you remove the pilot drill ;-)
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Why did you do it this way opposed to expanding foam and skim?
I didn't have any expanding foam for starters.
Thanks for the comment
Why dont your put a square air vent it might come handy in the future also you get more air circulation in the room
The room would be freezing cold in winter.
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The girlfriend... Yours? That's a big core drilled hole
Each one teach one thanks
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If I wanted to cut a square of thermolite to fill a hole how would I cut this?
You can cut thermolite using just an old wood saw- it is very easy to cut. It will knacker the blade though- you can also buy dedicated saws for cutting it- fave.co/2Q2SKo8
Blades are also available for reciprocating saws.
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