Need advice on insulating my shop

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Forum topic by BobinSachse posted 12-06-2016 09:50 PM 599 views 0 times favorited 3 replies Add to Favorites Watch
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48 posts in 2052 days

12-06-2016 09:50 PM

Topic tags/keywords: insulation shop metal building question

We just moved to a new house and I am lucky enough to have a 25’ x 30’ metal shop building. There is an 8’ garage door on it and 4 sky lights in the roof.
The walls are 11’ high and each roof section is approx 14’ from the top plate to the roof ridge.
It doesn’t get SUPER cold here in North Texas, but cold enough to need more comfort in the winter and cooler in the summer.
The frame of the building is 8” x 8” posts with 2×4s as wall stringers. The previous occupant has plywood and peg board all jigsaw puzzled together on the walls.

I have looked at some insulation available to me that is approx. .5” closed cell foam with radiant barrier on both sides. It needs to be glued and screwed to the wall stringers and roof joists. I figure I will need about $1k worth of it to get the job done if I do it myself.

Future plans are to have a small Franklin stove for winter and a Window AC unit for summer. As well as a 3’ Man door for additional access. There is a 15’ deep lean-to roof off of one side of the shop as well where my boat is parked. I want the get my Dust collector and possibly my compressor out there too.

My main task right now is running electrical and doing the insulation.

-- Bob Y.

3 replies so far

View Jim Finn's profile

Jim Finn

2780 posts in 3524 days

#1 posted 12-06-2016 10:43 PM

Blown in insulation comes to mind. Easy to do with an assistant. 70% of heat loss and heat gain is through the roof so insulation there is most important.

I would install surface mounted conduit to wire the shop using 4-ples outlets instead of duplex outlets.

-- No PHD just a DD214 Lubbock Texas

View Hermit's profile


239 posts in 1927 days

#2 posted 12-07-2016 01:43 AM

Thank you for your service Jim, I too have a 214.
My advice is to not skimp on the insulation. You’ll thank yourself later.

-- I'm like the farmer's duck. If it don't rain, I'll walk.

View tmasondarnell's profile


119 posts in 2391 days

#3 posted 12-07-2016 01:59 AM

Congratulations on the new shop.

I am in Central Texas (outside of Austin) and have a 35×50 metal building—not my shop but my wife’s horse barn.

Based on our experience, if you are planning on conditioning the space during the summer, I would recommend on significantly increasing the insulation on the ceiling. The 0.5”closed cell might give you an R4. During a Texas summer, there is no way a window rattler AC is going to keep up. I would look at either doing batts (there are ones you can get specifically for metal buildings) or if it is in the budget, do close cell spray foam on ceiling/walls.

Trust me, even during a “mild” July day in the low 90s, the entire building is going to turn into a hot box.

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