Framing a Garage Slab Over Living Space | Structural and Waterproofing Details
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- เผยแพร่เมื่อ 4 ก.ค. 2024
- Welcome back to our channel! In this video, we bring together all the essential steps involved in framing and waterproofing a garage slab that sits over living space below. Join us as we explain the engineering behind the wood floor framing, subfloor waterproofing, and the placement of the concrete slab. Our goal is to control and manage cracking, ensuring the longevity and stability of the structure. We'll also discuss the cosmetic aspects and how we matched the floor height of the main house for seamless accessibility. Additionally, we touch upon the considerations for lateral loads and seismic design in high-risk areas. Follow along as we showcase the process of framing the floor system and provide insights into the installation techniques. Our expert subcontractor guides us through the crucial steps of joint tooling and placement of the concrete slab. Throughout the video, we emphasize the importance of collaboration and listening to experienced professionals in the construction industry. For more technical details, check out the companion videos on the Build Show network by our partner Pioneer Builders Inc. Subscribe to our channel, like this video, and leave your questions in the comments below. Let's dive into the fascinating world of garage slab construction!
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0:00 Introduction
1:25 Controlling Concrete Cracking with Contraction Joints
3:10 Matching Floor Height and Wheelchair Accessibility
4:45 Feathering and Waterproofing for Rainwater Management
6:20 Designing for Seismic Loads and Occupant Safety
8:05 Structural Elements: Beams, Columns, and Footings
10:15 Foundation Work and Supporting Loads
12:10 Framing Walls and Floor Systems
14:35 Waterproofing the Assembly
16:20 Placing the Concrete and Tooled Joints
18:05 Importance of Collaboration with Experienced Subcontractors
19:40 Reflecting on the Journey from Excavation to Completion
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Please remember that I'm not showing the best way to do anything, but just the method that works well for us. Thanks for watching!
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Thanks Tim. Thoroughly enjoyed this as ALL your content. Just to let you some of your subs. I’m an 80 year old retired 3 times living in the Northeast. I’m an avid diyer and have done many projects on my houses over the years. Thanks again.
Great video! Always blows my mind pouring cement over wood, but if they could create Venice on the same premise, why not!
Great stuff! Thanks, Tim and Bryan!
That was an awesome way of planing the job out and your explanations are spot on.
Fascinating video. I am thinking about doing this for my home studio!
Very interesting. Love this option.
I have always wondered what it would take to do this safely - It would be awesome to see the engineering specs for this garage.
I like to use LVL joists, 1 1/8" subfloor, and a reinforced slab for these situations. Nice vid.
Looks good you guys
I am so glad that I’ve come across this video as I am building a similar garage over a wood structure - very similar from a structural design point of view - but with a different membrane (but I like this one much better!). I really like how you detailed the slab at the garage door, making sure water won’t get in the structure below. Great video, awesome work! Thanks Tim!!
Awesome 👍📐🔨
Awesome video
Sounds room, how about bomb shelter? Great information in this video! Thanks Tim and everyone at Awesome Framers!
Glad I came across this video, brought up many good points, decided to incorporate similar design into my garage plans. Had architect review my design intent and local lumber yard sized up the carrying beams. Ended up with something very similar to design from the video. But, was wondering if you use temporary shoring during the pour? Thats where I've run out of local knowledge, since it isn't typically done locally. Seems like there would be suitable margin for the wet concrete given its not supporting vehicles at that point, but figured this was something you may be able to comment on? Also love the channel appreciate you sharing how things are done there.
Did you do a coat analysis on wood frame against concrete plank?
Thank you for the in-depth video documentation! Did the wall below, next to the retaining wall, that is bearing the joists eventually get shear sheathing?
Nope, no need.
That LVL, looks like an easy use case for a steel beam/steel i-beam, which may have negated the need for the posts in the middle of the room.
I wonder how deep that would be?
@@AwesomeFramerscertainly cheaper to go deeper with a beam or even cheaper with a post than thicker beam. But not having a post in the dead center of room imo is way better for using the space
@@zefrum3 how would it be "cheaper to go deeper"? The beam to carry the loads would likely be closer to 6 3/4x 24" GLB.
This is new to me and very interesting. Is concrete required for the garage floor or could it be another material? I don't know other options aside from multi-layer plywood (for strength) with a protective layer on top (maybe epoxy).
Answering my own question I assume movement has a lot to do with this design.
A race car trailer is just 1/2" plywood with cheap vinyl peal and stick flooring. But in a house it also needs to be fire proof between the garage and house. So maybe osb, backer board and ceramic tile.
Why not use a steel deck designed for concrete slabs?
Over here on the east side of the Cascades they have us use T.P.O instead of ice guard or membranes....
But t.p.o coat about 4.70 a sq.... what's the cost of the membrane?
Do you guys ever need an extra hand? I'd love to come play whenever I go visit family in WA.
So can you guys not use a floor drain in this instance? Is that why you didn’t install? Just wondering I’ve only ever did a simple slab garage
No need to drain. The amount of water coming off two vehicles is actually very very little.
I would like to see a floor drain anyways. Just for those real snowy days(I'm in Buffalo NY tho), pulling in there w\ a snow covered vehicle would produce a bunch of dirty water💦. 🤷♂️🤔 Or rinsing (salt) off a car in the winter 🥶 time? 👍✔️🛠️📐🔨📏
@@tdotw77 good point, this is in climate zone 4c
How does the heat or cold transfer between the garage floor and the room below? What does the insulation look like?
Great questions. I'll defer to a future video when it's done. Insulation contractor was out last week to work up a bid. I believe the joist bays will get R38 batts
I can’t believe they built it like this. I have a 3 car garage with a 3 car under garage. The footings had to be 8 feet under ground (unlike 4 ft for the rest of the house). 12” core filled block, 12” steel I-beam over the lower garage door. Then they craned in Spancrete panels before 4.5 inches of concrete over it to finish,
Seems concerning… But if a structural engineer signed off on it, I guess it’s good to go…
Could've been your soil, could also be that the additional three cars in the under-garage would add a whole lot more load to the foundation. And of course don't discount that they don't need to design for wind loads as their bounding case.
Can't believe it? Interesting phrase as I mentioned the structural engineer many times 😁
The question isn't how they did this it's the earthquake Zone any property is located in. I'm guessing you're in a high Seismic zone or high water table zone.
@AwesomeFrahello nice work it reminds me of working with my own father doing construction . As my dad used to say unless you're in that trade don't judge but learn something new on the job. If you're in the Seattle area next year in October I'd like to buy a beer for you. Keep up the awesome work.
Hi , your job is great and you are professional at it. Can you please explain (in hint if its going to be long) how to build a wooden house from foundation up to the roof . With much a appreciation.
Check the rest of this channel 👍
Did you consider pouring a suspended structural slab, then framing a dropped ceiling under it? This seems more expensive I would be curious to run the numbers…
Add up the cost for a suspended ceiling structural cost and post it here. I can dig up the materials cost as shown here. I bet it's a wash or this is less.
I imagine things being alot beefier for such a load. Surprising it only takes 2x12 and joist hangers.
Nope, it takes a center beam and lots more concrete too
Always, Always, Always roll the big roll of tape!
How weird.... im working on a big 64x24x16 shop with concrete over subfloor coming up!!!
Why do a concrete floor instead of wood in this case?
long term durability
No steel, because maybe u used so many pounds of plastic fiber per so many yards of concrete?
I'll take a crack at the answer. Steel is only useful for tension, which means the slab has to be deflecting slightly for the steel to be in tension.
Since they can easily control how rigid the substrate under the concrete is (which you cannot as easily do with stone over dirt) take the money you would spend on steel and beef up the substrate so you have minimal deflection in the wood framing/subfloor.
@@jonblakemore6454 your point has nothing to do with my statement was their plastic fiber put in the (supposedly) 9 yard trucks of concrete before they poured it.
@robertgeiger2268 just saw your comment. Fiber and rebar have two different functions. Rebar adds structural strength, fiber prevents plastic shrinkage cracking.