insulating a shop with cinder block walls question

« back to Home Building & Construction forum

Topic by brantley posted 07-28-2010 12:56 AM 6259 views 0 times favorited 4 replies Add to Favorites Watch
View brantley's profile


1 post in 3919 days

07-28-2010 12:56 AM

Topic tags/keywords: question insulation shop

Alright let me first say i have never done any structure work to a house besides putting up vinyl siding…, that is why i am asking you all this to better inform me on the steps i should take. I recently bought a house 3 or 4 months ago with a detached garage that is pretty much my shop. It measures 20×30 with a half bath. The shop and the house was built new 4 years ago. The walls are made of cinder blocks. The previous owner did not have insulation put up. In fact there is nothing up just the walls and the rafters on the ceiling. My question is if i were to try and insulate this shop what are the steps i should take? I dotn want an insane amount of insulation just enough to keep it bearable during the summer and winter. (i live in Ga, its 110 today). Ive been doing some research and it seems like i would need to put Rigid foam insulation against the walls and then frame in the walls with 2×4’s and dry wall? And when i was watching a show on DIY the other night they put the rigid foam, framed in with 2×4’s and then put roll insulation over the foam boards and put the drywall over that.

View UnionLabel's profile


70 posts in 4122 days

07-28-2010 02:56 PM

Rather than taking the time to write it down here, let me redirect you to a site. Foam comes in 4 X 8 and 4 X 9 sheets. It is 1” thick and is rated at an R-value of 6.5. Also, insulate the ceiling. http://www.ehow.com/how_5690549_insulate-cinder-block-wall.html
Insulating the ceiling is easy, install some temporary bar clamps between the rafters and thread R-11 kraft faced insulation over the tops of the clamps, the staple the paper to the rafters.
Also, you can install OSB on the walls instead of drywall. Makes mounting cabinets, racks and tools real easy.
Drywall the ceiling to protect your insulation. Also, don’t forget to leave yourself an access way to the attic area.

-- Methods are many,Principles are few.Methods change often,Principles never do.

View Craftsman on the Lake's profile

Craftsman on the Lake

70 posts in 4437 days

08-09-2013 02:11 AM

If you’re going to 2×4 stud in the place, simply put 3.5” roll insulation in between the studs by stapling it to them. Then staple rolled sheet plastic over that as a vapor barrier before you put up your sheetrock or whatever you want on the walls. That’s how all houses are done in Maine. Be sure NOT to put a vapor barrier (plastic) between the blocks and the insulation. If you do you’ll get water running in your walls. you’re good for zero degrees or 100 this way. And of course do the ceiling.

If your blocks are above ground this is perfectly fine. If below ground, like in a cellar, well then you’ve got to think more of water resistant stuff.

-- Tryin'

View jstegall's profile


7 posts in 4329 days

08-09-2013 08:09 PM

One more thing you could do for insulating the ceiling. Run string perpendicular to the rafters, putting in insulation as you go. The string holds it up until you can hang Sheetrock or just leave it in place. Finehomebuilding magazine had an article showing how someone did this way back when they first began. I was going to insulate under a floor this way but stapled chicken wire in place to keep varmints out after the string.

Edit: on the FineHomebuilding forum, they put a fine mesh over studs on the wall then made slits at the top and blew in insulation. This was easier than messing with fiberglass, especially in the heat. They called it a Mooney wall after a forum user who first posted pictures of it. A builder in Rhode Island began doing all of his jobs this way. He and his crew loved it. You can get the blowers for putting in the insulation free from HD if you buy their insulation. It was quick and easy to blow in.

-- John

View rhys234's profile


488 posts in 465 days

08-30-2020 11:24 AM

You must be signed in to reply.

DISCLAIMER: All views and comments posted by members are not necessarily those of HomeRefurbers.com or of those working on the site.

Latest Projects | Latest Blog Entries | Latest Forum Topics

LumberJocks.com :: woodworking showcase