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How to Build an Insulated Shed Floor 10x12 Workshop

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If you are looking to build a shed floor this video is for you. I am making a 10x12 outdoor office or workshop space. This foundation is made from 2x6 treated lumber with joist hangers and 3/4" OSB. The insulation is 2" foam board rated at r10. To help make this floor bounce free I also use liquid nails adhesive under the OSB. Paver stones bring the base up off the ground to allow for air flow and to get the foundation level. 6mil plastic is used to prevent moisture from getting into the building from the ground.
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Опубликовано:

25 авг 2024

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Комментарии : 62

@dnunz1247 Месяц назад

Looks like an excellent area for black mold 👍

@sethcraftworkshop Месяц назад

Without a barrier there would be mold for sure! The plastic on top of the concrete make a big difference in keeping the ground water from resting on the osb.

@Lipohar97 9 месяцев назад

I've done a few insulated sheds, normally you would want to use vapor barrier instead of OSB because the OSB will get wet and rot. Make sure the vapor barrier runs over the outside of the framing and continue it up the insides of the walls. Good luck with your build hope it goes great!

@spencerdasilva 2 месяца назад

I was thinking the same. Any osb not fully under the floor will get rained on plus the edges will get exposed to moisture. What would you have chosen as flooring?

@SirSloop1919 5 месяцев назад

seems like a really good spot for critters to build nests under...

@westhavenor9513 10 месяцев назад

Very nice! I think since you have a PT lumber foundation, and the rigid insulation is a vapor barrier in and of itself, you could skip the plastic. I can see it getting all nasty under there with the plastic. Alternatively, you could have put the plastic layer between the insulation and OSB. I would have liked to have seen some panel adhesive between to OSB and insulation. The insulation probably won't shift, but that way you'd be sure. Also, scrap pieces of asphalt roof shingles between pavers and joists will prevent moisture wicking. Great job though--there's a hundred different ways to do it.

@onnoexperience Год назад

thanks for the video. I am just about to start the exact same build in the UK. Spent last weekend digging out foundations and have ordered all the wood / insulation for this weekend. I hope my build goes as smooth as yours!

@sethcraftworkshop Год назад

Very nice! Having all the materials on site is a big plus. This build took over 2 months because we only worked a couple days a week and filmed it all.

@veelink6345 7 месяцев назад

That extra inch in length going to really make the siding and roof planks fun....

@sethcraftworkshop 7 месяцев назад

Yes the extra floor length was cut out of there. Otherwise it would have been terrible.

@user-zk7sg8sb1k 19 дней назад

Very nice, I'd have used 3/4 plywood and added some center support pavers to make the floor as capable of heavy load as it is sound and stable.

@sethcraftworkshop 17 дней назад

I did not show on the video but center support was added. The next build on the channel does use 3/4" treated plywood for the floor.

@kevinmoore3033 Год назад

Just found your channel. I am building a 12x20 shed.

@sethcraftworkshop Год назад

Thanks for watching! A 12x20 will be nice. Be sure to check the new build series of a 20x30.

@lesglover6515 Год назад

You guys built one hell of a floor there! Excellent!!!

@sethcraftworkshop Год назад

Thank you. The homeowner wanted no bounce so that's what we built.

@Sylvan_dB Год назад

Anything between the cement blocks and the wood? Water wicks thru cement so I usually use an asphalt shingle as a moisture barrier between the cement and the wood. Treated wood is worth considering. You could probably use a jack or even a lever to slightly lift and insert something.

@sethcraftworkshop Год назад

That is a great idea! I will see if we can lift the building enough for a piece of shingle. Thank you.

@3wheelmannc860 7 месяцев назад

Very nice. Thank you.

@ronalves9118 11 месяцев назад

Sub floor should ALWAYS be Perpendicular to floor joist

@sethcraftworkshop 11 месяцев назад

Because this building is so small I don't expect an issue. But you are right going the other way would have been better.

@jllaine Год назад

Nicely done. Your cuts were really on, the blocking and insulation you showed were all friction fit.

@sethcraftworkshop Год назад

Thank you. So far this build has done very well. I tried to get the floor as spot on as possible. The floor insulation fit was good.

@adriancurte4492 Год назад

Very well explained! You help us allot! Hope your channel grow!

@sethcraftworkshop Год назад

Thank you for watching. I'm glad to hear that it helped. I will be building a much larger shop soon that will have an insulated floor and I'm going to add 1/4" hardware cloth on the bottom to help prevent rodents.

@mmbodnar Год назад

That 3'11.5" wide T&G subfloor just tricked me as well, Dosh Garnet!

@sethcraftworkshop Год назад

I know! That was frustrating. Had to cut a small strip to make up the gap. I am not sure why they even do that.

@royalwapiti Год назад

That foam is mouse food and nesting material. Might just throw some reflective bubble wrap down on joists. Skip the foam.

@sethcraftworkshop Год назад

Ah good point. In my next build I am going to install 1/4" hardware cloth below the insulation to prevent rodent damage.

@owenwiseman6112 Год назад

How do you stop the insulation from falling down over time and sitting on the ground? You didn't appear to fasten it at all, is it held up by nothing but friction?

@sethcraftworkshop Год назад

Friction is holding these up. It was a tight fit. In my next build I will install hardware cloth under the insulation to keep rodents out.

@benjimanlee 5 месяцев назад

You can just pop a couple of screws in if you want to but if you can get them as tight as this they’re going nowhere

@Manu-fv4cc Месяц назад

But but… how about the condensation that will create in between the insulation and the plywood floor??

@ronalves9118 11 месяцев назад

Rodents will get up under that floor and use that insulation for bedding.

@sethcraftworkshop 11 месяцев назад

Not sure how mice handle the ridged foam insulation. Time will tell if holes are made.

@westhavenor9513 10 месяцев назад

Rodents will probably get under the foundation regardless, but they're not going to bother with ridged insulation

@ronalves9118 10 месяцев назад

@@westhavenor9513 Well here in PA and SC I have had rodents get into some ridged foam insulation. Not sure where you live.

@chriskuhn2988 7 месяцев назад

You did not tap your tongue and groove gap together

@richardb.5691 8 месяцев назад

You need to "crown" all your boards. Convex side up.

@sethcraftworkshop 8 месяцев назад

That is a step I did not show on camera. I made sure to show that on the new 20x30 shop build series that is now on the channel.

@seaandearth 11 месяцев назад

Do you sell the drawing, I loved it and I want to build one in my yard.

@sethcraftworkshop 11 месяцев назад

Sadly I do not have any plans. I tend to just go out and start building when I make something like this.

@johnstevener501 2 месяца назад

So no permit needed i guess?@@sethcraftworkshop

@roberthopgood1894 Год назад

Should have put rodent proof wire screening under the plastic Or they will shred the plastic & destroy the Styrofoam

@sethcraftworkshop Год назад

That is an interesting thought. I have two sheds at my place with plastic and so far after 2 years the rodents have not destroyed it. BUT I can see that being an issue.

@busty1372 Год назад

They are there.

@sipdancedesignartentertain1951 9 месяцев назад

That's what I worry about. Animals eating their way through my floor..

@sipdancedesignartentertain1951 9 месяцев назад

For my shed foundation I wonder if I put down a tarp, wire mesh and then gravel to keep the rodents from eating their way into my flooring from under the shed?

@Naoj2024 10 месяцев назад

I dont think you put glue on the foam to hold it in place ? It wouldn’t have taken much .. Nothing seems to stay without some sort of fastener… 😉 nice job though..!

@sethcraftworkshop 10 месяцев назад

On this build there was no glue on the foam. Now on my 20x30 shop build I did install some caulking to close the gaps in the foam.

@christopherchurch6989 4 месяца назад

Maybe should've put some glue on the insulation

@sethcraftworkshop 4 месяца назад

In a later build I caulk the insulation and it works well.

@steph777sl Год назад

How many 2×6's are needed?

@sethcraftworkshop Год назад

That will depend on the spacing of your floor joists. In this build I did 24" on center. 13 total 2x6. 7 at 10 foot 6 at 12 foot.

@nmf66 Год назад

Hi, is it essential to have a gap between the base and concrete or could the damp membrane just be in between the base and floor so the frame sits directly on concrete floor?

@sethcraftworkshop Год назад

.I personally like to have a small gap to allow air flow, but if your concrete slab is perfectly level, you could build directly on top of that.

@coreydwood Год назад

which one has 11ft and 9 ich lol (the first cut ) im guessing the 12 ft one,, im trying to follow u,, 1st time,, nevr did this b4.. so u keep one 10 ft and the other 11 ft and 9 inch,, wait ill keep watching

@sethcraftworkshop Год назад

Either the sides or back/front can be full length. One or the other needs 3" removed. It basically depends on the direction of the floor joists.

@MrTkshiu 4 месяца назад

@@sethcraftworkshopwhy 3"??

@ronalves9118 11 месяцев назад

WOW so under built. Floor joist should be 16 ' on center.

@sethcraftworkshop 11 месяцев назад

For a detached office space with walking traffic this foundation is more than enough. Now if you will be placing an ATV on the floor 2x8s should be used.

@spencerdasilva 2 месяца назад

It’s a shed base, not a house.