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Garden Room Workshop: Part 9. Flat roof structure
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- เผยแพร่เมื่อ 17 ส.ค. 2024
- Find the full series playlist here: bit.ly/2BiLSyC
Part 9 of a video series about how to self-build a timber-framed garden room office (aka tiny house)/wood workshop in the UK.
This video covers cold roof vs warm roof, firring strips and roof joists.
The purpose of this video series is to provide all the information required for viewers to build their own garden room rather than just a montage of the building work. It took me months of research to learn everything in these videos so I hope to save people time and money.
The videos are a mix of theory and footage of the build including all the mistakes I made along the way. I am not a builder or tradesman, just a keen DIY-er with some basic tools. Everyone can do this!
In the longer term, I hope to turn this channel into a community for garden room self-builders and to eventually evolve into a woodworking projects channel - the real purpose of my garden room!
Garden room ideas: workshop, office, games room, cinema room, art studio, music studio, yoga retreat, spare bedroom, annexe or run a home business such as yoga classes or hair salon.
🌍My website - www.alidymock.com
📸Instagram - / alidymock
💌 Email - hello@alidymock.com
Tools used:
Circular saw
Mitre saw
Impact driver: www.screwfix.c...
Hammer
Tape measure: www.screwfix.c...
Pencil
Clamps
Speed square
Ladders
Tarpaulin
Safety: gloves, eye-wear, ear protection, dust mask
Materials used:
225 x 47mm C24 timber x 6metres
Screws 100mm
Nails 100mm
Angle brackets: www.screwfix.c...
Square twist nails 30mm
Trada span tables:
www.trada.co.u...
Kingspan U-value calculator:
www.uvalue-cal...
Good websites to check prices for materials :
www.selcobw.com/
www.builderdepo...
Music:
/ aka-dj-quads
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As an audio technician, i want to thank u for the upgrade in your gear!!
Haha I went from a blue snowball to Samsun q2u with audacity. Feel free to email me any recommendations for better sound 😊!
Of all the videos on building a shed, yours is the best one. I
What a superb detailed series of videos. Theory necessary and explained to perfection. Keep up the good work and thanks for taking the time to produce the videos.
You know what mate, I ve been waiting for the builder to finish the roof for ages and you inspired my to finish it myself, I am just gonna do it!
Do it!! A flat roof really isn't that tricky 👍
@@AliDymock any more projects on the go?
@@andypowlesland599 Yeh! Moved house, made a potting table (2 vids out on those) and a side gate (vid to come on that) and now doing fencing before re-doing the roof of my garage! Busy!
Ali Dymock thats great! I’m a landscaper who takes on similar jobs! Just about to build a 12x12 t and g shed that is fully insulated and able to break down to 8x4 sections for transporting when we move in a couple of years!
@@andypowlesland599 Nice!
Thank you for this video Ali . I am self building garden shed alone and was struggling with how to keep the long facia board in place , screwing a bit of wood at each end is great . 🤗
Stunning build, you should be proud of yourself for it (and doing it solo). Love the theory bits and explaining it all really clearly.
Thanks Alex, much appreciated. I guess I am sort of proud, but will be especially so when it's complete and so is this series. Some way to go with each!
This couldn't be better timing! Thanks to Keith Brown for putting me onto your series of vids. I'm in the throes of planning an extension to my own 12' X 10' shed. Going to add - subject to planning (I live in a conservation village in the North West of Scotland) - another 8 feet (20' X 10'). Your vids have been very, very helpful. Thank you so much. Hope the rest of the build goes well. Best aye!!
It was very kind of Keith to give me a mention, glad the info is helping you out. Always good to have another Alistair/Alasdair on board, thought 'Ali' would be easier for people to remember though! 😁
Yup. As one Ali to another, I've been called many things... I really admire what Keith's doing too. It's a very helpful community. Cheers!!
This is an amazing resource for a keen DIYer such as myself. I was pretty worried about getting the right pitch of my flat roof in my design.....and then you tell us about firring strips! I have never heard of these before but they have completely solved my problem. The gift that keeps on giving! 😂👍🏼
It's the little things :)
The question of whether or not to use sloped joists is an interesting one. I'm currently building a garage and using CAD will help provide me with accurate dimensions when cutting the studs.
Fantastic set of videos, I've been looking for something just like this for ages. Can't wait for the next updates!
Thanks Neil! I'll be working on the warm roof vid this weekend 👍
These Videos are Incredible .Seriously. It's very technical , informative and educational. Hate looking at Actors all the time with their make up. These type of videos are 100%
Perfect. Best video on YT by far. As a learner I can now attempt my new roof
heheh, glad you like them Naz!
Hi everyone, thanks for your patience! A lot of theory in this one so had to create a lot of slides.
As before, if you tell me the span etc. for your garden room I'll help find the right joist depth for you 🙂
EDIT: I've now created a span table document you can download here: www.alidymock.com/resources/
Hey Ali, thanks for your videos man, I am following them all and I am planning to go DIY with my garden office!
I am planning to build my garden office with concrete block walls. The garden office will be 8m x 6m in depth, could you tell me the right joists and spacing for this, or should I go with engineered ones? Thanks again
I think finding joists to cover this length is hard?
Hi Ali, excellent detailed videos. Looking forward to doing this in the spring. Have you any of this info in spreadsheet form or similar? Some sort of step by step written guide? Many thanks, Josh
I am trying to work out the spec of my door header to span a 3.6m bifold door. Do you have any idea what I would need if I was using c24 timber?
@@joshuaomalley972 Sorry for the delay in replying, just saw this. I have written more on the website but the idea was that videos are easier to understand than written form, don't you think?
Hi Ali again very impressed with the way your build is progressing i understand the options you had with the pitch of your flat roof and the best way to go about it off course using firring strips would have been a lot easier and less time regarding labour and working out but in the end i think going with the option you did was the best way to go giving your fascia boards a uniformed look around the building i also liked how you used the angle brackets and twist nails again instead of just cheek nail and screwing your joists also giving the joists a more solid fixing especially on your overhangs and loved your top tip with screwing temp timber hangers to sit your fascia boards onto for you to get your first few fixings in place a great tip for people doing this kind of work on there own as always massive thumbs up :)
This is AWESOME !
Perfect for learning
Really good! Thanks for taking the time to film edit and post. Very useful
thanks Simon!
Outstanding again. Well done Ali 👍
Thanks Paul, very kind of you to say. Hope it's useful for you.
Thanks for the explanation Ali, it's really helpful as I'm building a home office atm for a client.
Just reading/watching after Keith mentioned your build. Very impressive planning, build and especially well presented videos. The information and time you take to explain not just the choice you made but other options for context is so well put together. I'm in the middle of my garden workshop build (much smaller and a little less engineered than yours) and very happy with how it's going but knowing how much work it is without videoing it all, well done. I have help/advice from friends as I got too so your solo build is impressive. Cheers for taking the time.
That's great, welcome to the channel Darren! It really does take so much longer filming everything and even longer editing the shots into an intelligible video but given the response so far, this information really needs to be out there it seems!
Would like to see some photos of yours, might work on a FB page or something for people to share.
Great series of videos, from foundations to the roof. I haven't seen any footage on TH-cam so logically laid out, perfect format. Guys like that should organize workshops, it would be beneficial for both sides...
Thanks Igor! There's plenty of workshop organisation to be done, don't worry about that haha
Love your informative and insightful video
Excellent for additional information.
I so love you choice of music in these videos!
You'll like part 10 then!
Can't wait!
subbed, glad to see you finally got the voiceover audio levels right.
Got there in the end ehy. It’s just not that easy on iMovie for some reason.
Awesome video and nice songs playing. Congratulations!
Cheers Jake!
Ali Dymock , thanks again. 👍👍👏👌
It's was very useful video.I will build the small house in my sister's garden.Thank u.
🤓
Brilliant, well articulated and with good camera coverage. Very enjoyable series of videos.
Thank you kindly! It's hard to know whether the level of detail is right when putting them together so thanks for the feedback!
Excellent job 👌💯
Once again, top work and well though out. Been planning my man cave build for ages and you once again have validated a lot of decisions I have made. I am the same as you, not a builder and this will be the first time I have ever done a build like this.
How did you get on. Did you build it
@@MrJonpac yep all built 👍🏻
@@vikingofengland
Nice one.
Just doing mine now .
I've copied it exactly .
Great videos
Really useful information. Thank you
Amazing. This is exactly what I'm doing over the coming weeks and without your videos I would almost certainly have fucked it up. Feeling much more confident about it now thanks :D
Great stuff Dan!
Fantastic work!
Very informative. I’m planning to build
Outstanding workmanship. If not a little to precise for what I need but I've certainly got a better understanding of setting out my new build... 16x12.. especially looking forward to the weather proofing stages
Great work
Yup, some viewers will want to build theirs like a house and others will just want a glorified shed-there's no right way. Glad you're enjoying it.
Spot on mate. Nice one.
Brilliant video mate! Really appreciate you taking the time to explain it all! This series is both very helpful and insightful!
You're welcome! I'm glad you're enjoying it mate 👍
This is so great. Thank you for posting. I have been looking for examples of this being done in the uk rather than just the states for ages.Can't wait for the next instalment.
it's up now, I just haven't linked it to this video yet!
Just watched and commented. Thanks. Would you consider releasing your sketch files?
Sketchup? As mentioned in a previous video it's not particularly detailed, but sure! How do I do that?
Hi Looking forward to the next video. I hope it is going ok. You could upload a copy to dropbox and publish a public link to it here. I think you can do that in the comments section.
If for any reason it doesn't play correctly on youtube I'll look into that. Just editing part 11 at the moment.
I’m about to do mine, but I will install 2oz fiberglass mat on top. That will help a lot.
Watched for 2nd time, good work there . Looking forward to your nxt update.
Just brilliant and too detailed. Searching for similar content and found it
Great videos Ali, very detailed and useful. Keep up the good work
Thanks! Love the way you do it. For me, your series is the most useful found on TH-cam. Can't wait for the next episode😀
Thanks, that's nice to hear. It just takes a long time to do! I think the quality is improving with each video though.
Nice work Ali
I was recommended your channel by Rag 'n' Bone Brown in his latest TH-cam Vlog and I'm so glad he took the time to do that. I've watched a lot (A LOT) of workshop build videos and your series is by far the most informative and skilfully produced. You've clearly spent a lot of time and effort putting this series together - I hope it goes on to reach a much much bigger audience because this series is a gem. I can't wait to see what you create and build in it. :)
Wow what a lovely comment Maria, thank you! The number of new subscribers who came over from Keith’s recommendation shows that there are people interested in this subject, they just haven’t come across the videos yet.
Quite a way to go yet, but really looking forward to doing some proper woodworking too!
Ali Dymock, you deserve every success. I don't know how it all works on TH-cam but this series would be invaluable to anyone embarking on this type of project so I hope it starts appearing everywhere and your subscribers increase week on week by at least the number of screws and nails you've used so far :)
I love the music you use too :)
Best videos on this subject by far. Cant wait for the next one.
Nice video bro
Thanks for taking the time to make these. I'm starting a similar project and not having done one before it's pretty daunting. In depth videos like this are a great source of information (and confidence!) Can't wait to see the finished project but enjoying the stage by stage process. Great work - thanks!
I'm really glad it's giving people confidence, that's fantastic-exactly what I wanted 👍
Hi Ali . Many thanks for your great Videos. Simply some of the best guidance videos I have seen. Coupled with great knowledge and explanation. I am currently starting to design my own 6m x 4m Games room. Coming across your work couldn't of come at a better time. I shall be taking your advice on-board in my own build. Can't wait to see your finished room. Keep going it's all worth it.. Thanks again
Great stuff Paul, sounds like an awesome project. Definitely will be having my table tennis table going in mine, can't wait.
Nice videos Ali. These are very well made videos and I like the Lofi Chill Step interludes. Enjoyed it and took 2 pages of notes. I'm building a similar sized room as your garden room. But I'm going to be brave and attempt an L shape keeping it under 30m2.
Hi John, thank you. You're the first to mention the music! I think I've sorted out the sound levels now so hopefully they add a bit of fun to the videos and something to look forward to after all the info!
Sounds like a good project. Feel free to ask any questions and thanks for subscribing
Furring strips on a warm roof also mean you have a small cavity where humidity can condense on your top sheet of osb. As a result you need to vent the gaps between the furring strips to stop rot issues down the line. Steve roofer has some videos on this issue.
Rake walls definitely the best choice
Not sure I follow this George, the furring strips will be under the OSB, on top of the joists, and will be warm in a warm roof structure so no condensation. Obviously with a cold roof the gap above the insulation (whether joists or furrings strips) needs to be ventilated.
Sorry Ali I rewatched your video and realised I had misunderstood what you presented. You are absolutely right that the furring strips go on the top of the joists whether cold or warm roof. The scenario i was thinking of is when people lay the furring strips above the insulation on a warm roof, creating a small unventilated cold cavity.
very nice job well done I'm building one at the moment but going to use rock wall as its much cheaper just going to finish the roof completely first then windows and doors and then put 18mm moister resistant chip board floor in after words and insulate it top to bottom afterword's. also if you counter batten the ceiling joist you get all your cross flow and ventilation very easily it saves thousands of pounds, as you can use loft roll insulation and no planning required as you will only be 2.5 meters max. I'm estimating 7 grand in total its 7m by 5m with a glass fibre roof and I'm using reclaimed windows and doors.
Sounds great Ryan. I can say that mine is crazy warm so I think rockwool is a great option 👍
Looking mega pal, keep up the good work
Cheers Phil
Waited a while for this vid, will watch again for extra detai, , thanks
Sent Via Keith Browns, watched all so far Great build, going to be an expensive build (for me that is) BUT once finished think will look BRILL
Welcome to the channel, thanks for checking it out. You're right, it's going to be more expensive than I first calculated but hopefully it will be worth it.
Thank you for such comprehensive explanation ,I hope to be starting my garden room shortly and this has been very helpful.
Just wanted to say hello from Dallas. Learning a lot from you and looking forward to doing a similar project like yours! keep the videos coming! amazing work!
Thanks Carlos! I noticed I had a few US subscribers which is great as I learnt all this from watching American youtubers. You'll have to ignore all the building regs/planning permission stuff as that's UK orientated. I think you have 'code' over there? I enjoyed Dallas, great to see people walking around in cowboy hats!
Actually, my regulations/permissions are similar to yours regarding size, location in the garden and Max. Height. but the limits are reasonable and sufficient for my needs. I like your ideas for the roof!
Interesting! May I ask, do you have PIR insulation over there, I’ve never seen anyone use it?
Yep. found it quickly on the home depot website. about $20 for a sheet of 4x8 (feet)
Gosh that's cheap! 😤
Another great instalment! 👍
Hi Ali thank you for making these videos! Well structured and informative. Subscribed!
:) cheers Michael!
many many thx
Bit of advice for those following Ali's excellent example.
At 13:48, Ali mentions that although he used the same sized timber for the fascia boards as the joists, it might be sensible to use thinner lighter timber.
I went ahead and used thinner 22mm thick timber and am now regretting it as there's little to secure the above layer of OSB to around the edges. I'd recommend going with the 45mm thick timber, although it is heavier and a little more expensive.
Very interesting Matt, thanks for sharing. I'm sure that will come in handy for someone trying to decide. Are you using nails, that may be better than screws in a thin fascia?
Screws as I thought nails would split it but perhaps you're right. I still have the joists to secure to but it just means I have to screw the OSB 2" back from the edge and only every 16". Same goes for the timber above surrounding the insulation. I just wish I'd gone for 45mm thick fascias as it would be much more solid.
Loving the videos so far. Gonna be starting my own workshop build very soon. Smaller then yours around 2.4m x 4.8m & 2.5m high. Havnt got room or money for a build quite like yours but should be ok for me
Excellent, that sounds like a pretty good size to me!
Ali Dymock its ok. I would of gone bigger & had less garden but the wife wasnt happy with that idea so i compromised. Happy wife happy life!
Thanks , this video help me a lot 😊😉🙏
thk mate i will build my house in Argentina with your tips!!
Thanks for the video..well done.
Cheers Jiri!
Great videos...really well explained..You answered soo many questions i had..Subbed!
I am loving your videos and currently starting out on the adventure of building a gym in my garden. Would it be possible to get a list of all the materials and equipment you use. You truly know more than most of the builders I’ve spoken to about my project
This video is awesome, really helped me thanks!
You are awesome
Great videos, but the 2.5 height is to the eaves and 4m maximum height, on a flat roof construction maximum height is 3m, obviously different councils may have different guidelines but worth looking into. Great videos 👍
Yup, see Part 3. 3m is only okay 2m from the boundary :)
There is also option #3 for slopes - insulation slope pieces, if your insulation manufacturer provides an additional slope accessories for it's system.
like this:
nav.tn.ru/upload/resize_cache/iblock/0e9/1000_0_1/TN_KROVLYA-Praktik.png
Hi mate, see you didn’t use jiffy hangers. Has the brackets held it all down with no twists?
Any reason you couldn’t put the firring strips under the joists and cut them flush to the walls? You’d get the benefit of a thinner roof and flat underside without the need for the hassle of the taller wall.
Awesome video, really appreciate it. Could you be so kind as to tell me the timber joist sizes needed for a 6.2m span at either 400 or 600cm centres? Many thanks in advance
If you use firring strips how do you deal with the gable ladders? They'd be fixed level with the top of the strip, which would be higher than the front fascia and wall head.
And 2 minutes after posting I realise you fit the ladder as normal and a firring strip on the outside rafter😖
So when laying the rafters on roof you don't need to cut birds mouth on the boards you can just use brackets
Could you screw the firring strips to the underside of the roof joists and just stop them at the front wall so you don’t have a wider facia?
hmm it's a smart idea, you'd have to fasten the firing to the joists first to stand any chance of working I reckon
Excellent. Shows how much it,beer prices have gone up, 6x2 is £30 for 4.8m 🙈
I know, it's mental isn't it!
Can downlighting even be an option on a cold roof? Surely, the gaps and heat inside the insulation is a no-go.
Just subscribed, you changed my mind in going for a warm roof instead of the cold one, maybe it past my eyes, you talked about it in your vid that the roof has a slight angle in order to get rid of the water, however your frame looks very straight on the walls, how did you create the slight angle?
I never seen any mention of ensuring the crowns are facing up!! For that span it is very important to prevent sag.
It is important. I mentioned that in Part 5 for the floor joists. It's a good point for roof joists as well 👍
Amazing series Ali!
Question about the space between the roof joists where they extend into the overhang :
Did you only use PIR insulation or is there wood blocking as well between the joists? And why?
good information!!!
Can anyone give an answer, making a horizontal roof with 5 x 30 cm wood boards / joists (30 cm being vertically) would the boards in 5 meters length bend from it's own weight and snow ? And what is the max spacing allowed between boards, is 70 cm enough ?
People knock Ebauer tools but that drill was a godsend.
Agreed! Always worth a punt with Screwfix tools as the return policy is so good, no quibbles at all.
Nice! I need 5.8m joists. Can i use the, as singular joists like you have? Or shall I double them up?
Great videos thank you, A question please did you not have to cut a birdmouth in the roofing joist so that they sat completely flat on the top of the wall plates please? Also what was the diffrence in height between the front and back walls to create the right slop please.
Easy to assemble a shed. Just follow this guide
Great videos thanks, I have a brick shed that needs a new roof, it's going to be flat with slight tilt for water, rough size is 4.3m x 3.4m, which way should my joists go, long ways or short ways, and how far do I space them apart? How many rows of noggins will I need, and what size and type of timber do I need please? I'm an absolute beginner and on a budget but I know I can do this with your help :)
With the over hang on the sides would it not have been better to leave the last full joist out each side so the small peices of joist were longer and had more of a canter liver to them? Fantastic series BTW I'm really learning a lot and is really helping me with my build I'm just starting
Thank you
It's a good idea and shows a good thought process. For. larger overhangs I'd say that is the better/only way but the downside is upsetting the joist spacing for plaster-boarding and OSB on the roof/ceiling so for similar or smaller overhangs to mine I'd say you're better off doing what I did.
Can we use that same roof and make a deck on top or I need to add beams ? And more ?
Awesome 🙏
2:11 some isulation are cut before hand to fit between joists of 600mm apart
True.
Love the series. It's helped me a tremendous amount. Currently just finished the floor.
I have a question about the long walls (not the rake walls). How do your ceiling beams sit flat on the top plates? Did you cut the ceiling joists or do your top plates match the pitch of the roof?
Or is it such a slight angle that it not something you have to consider?
I think we answered this on email Alex but for everyone else: mine aren't cut and so lift off the top plate slightly which is fine because the angle brackets do the job nicely but on a steeper roof you would want to cut 'birds mouths' which I will eventually get to.
Just a thought. A structural engineer might charge you £50-£100 to check your joist sizes. If you could have gone down even from 220mm to 195mm joists, that would have been worth it in material savings, not to mention the benefits of manhandling smaller timbers.
Hi Ali, happy to have found your videos which are helping me much to design my garden house, smaller than yours, it's going to be 3x4 meters, with flat roof, but i want it to be walkable to use it as a terrace. I wonder if you know what would be the distance between joist to safely support the weight of 4 persons?
Thanks in advance
Ho man, you can have a cold roof without thermal bridges, not more then on a warm roof, you extend the "warm" and "cold" roof design too far, the under structure can be the same. The only difference is that a cold roof got a ventilation underneath the last layer that will allow condensation to dry whereas the warm roof can't... dry, which mean the vapor barrier got to be perfectly sealed (on a warm roof near impossible to do)
I got a cold roof and i got an insulation layer that break all thermal bridges. In your drawings, you could add a layer of air then a layer of metal sheets over your warm roof... And it would become a cold roof.
I'm afraid you lost me there! Do you mean insulation under the joists with a cold roof? Then yes that helps a lot but in turn you lose ceiling height.
@@AliDymock Hello, i meant insulation over the joist then a layer of air then a metal roof for example, this would be a cold roof.. No thermal bridges. The definition of cold or warm roof is just the fact that the cold one got a ventilated air gap under the last layer (can be shingles, metal roof, ceramic tiles)
@@honumoorea873 Ah right, I thought the cold and warm referred to the deck above the joists and whether it was above or below the insulation and hence warm or cold!
An invaluable series of videos, many thanks! A slightly confused question re firring strips - I'm guessing they should also be laid on top of the side pieces so the overhang is fully supported right to the edge - in which case the fascia boards at each side will need to be wider (deeper) than the joists, presumably?
Found this series yesterday and now binge watching, very interesting, informative and well made videos, thank you for making them. I do have one question having watched this video. In an early episode I believe you said you were building up to the boundary, but you have now created an overhang on the side of the building, does this overhang the neighbouring garden? Not a problem while you live next door to your mum, but...
Awesome!
Great video converting my garage can I connect 2x6 to the existing wall by creating a wall plate . Also when you when for a sloped roof internally one side was higher then the other ?
Hi Ali. I'm building a warm roof garden room but due to the fact there is an overhang on the sides this means using full sheets of OSB on the roof means I either have to cut short the OSB (if joists and wall studs line up) or don't worry about lining up the joists with the wall studds. I can see from your video that you haven secured OSB to the edges of the overhang but your joists and studs line up, so did you have to cut some off your full OSB boards?