Model # 320817

Internet #202532855

Store SKU #614645

R-Tech 1-1/2 in. x 4 ft. x 8 ft. R-5.78 Rigid Foam Insulation


1-1/2 in. x 4 ft. x 8 ft. R-5.78 Rigid Foam Insulation

  • Numerous household, hobby and construction uses
  • Easy to cut-to-size and to install
  • Poly-facer provides excellent durability & flexibility

Frequently Bought Together

Product Overview

Insulfoam rigid foam is a high-performance built-to-spec sheathing insulation that provides superior R-value and moisture resistance. Made by one of North America's leading insulation and construction materials companies, it is offered in multiple thicknesses and dimensions, in both square-edged and tongue-and-groove joints. It is very easy lightweight and easy-to-use and provides an optimum balance between performance and cost.

  • Specifically developed for wall sheathing, siding underlayment and basement and foundation insulation
  • 8 ft. L easily cuts to desired size
  • Energy Star qualified to meet or exceed federal guidelines for energy efficiency for year-round energy and money savings
  • Moisture resistant with great insulating properties
  • Poly-facer on both sides for durability and flexibility
  • Note: Product may vary by store
  • How much do you need? Let our calculator help:
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Info & Guides

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Warranty / Certifications

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Customer Questions & Answers


Asked by: MARTHA
You would need to put plywood overtop of the foam to prevent damage to the foam.
Answered by: tjcst25
Date published: 2017-04-22


Can a polyurethane such as Great Stuff be used with R - Tech?
Asked by: dwn629
yes, but they recommend (window/door) so it stays more fliexible when wall systems move it wont crack
Answered by: joe
Date published: 2016-07-19

Can you paint over this insulation?

Can you paint over this insulation?
Asked by: MsPainter
This product can be painted with paint that does not effect foam.
Answered by: CommunityAnswer
Date published: 2017-05-06

What is the weight of a piece this size?

What is the weight of a piece this size?
Asked by: Sporiver
This piece of R-Tech weighs (4) pounds.
Answered by: GFactor
Date published: 2017-05-15
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Customer Reviews

1-1/2 in. x 4 ft. x 8 ft. R-5.78 Rigid Foam Insulation is rated 4.4 out of 5 by 16.
Rated 5 out of 5 by from Retch 1.5 inch perfect for garage doors This 1.5 inch polystyrene insulation is a perfect fit for newer non insulated metal garage doors. Way cheaper than the kits and looks great too. Just cut it with a razor knife and you're good to go.
Date published: 2017-01-31
Rated 5 out of 5 by from Great to work with I insulated my 6' X 12' enclosed cargo trailer every inch from top to bottom with this stuff, and was very impressed after I mounted a 5,000 BTU AC on the back door. It's like a walk-in cold storage freezer. lol The air condition unit now runs for approximately two minutes or less at every fifteen minute interval as opposed to nearly continuous 24/7. Sound proofing characteristics of this product are what I consider to be moderate to very good as well. As each panel went up I could notice the difference as it gradually eliminated an 'echo' throughout the trailer. Could not be happier. Excellent value per sheet. Fun to work with. I used a six inch 'utility scraper' razor blade to cut it up. :)
Date published: 2013-05-07
Rated 5 out of 5 by from 5 Star Review Rating provided by a verified purchaser
Date published: 2017-04-05
Rated 5 out of 5 by from Excellent product. Easy to install. Excellent product. Easy to install.
Date published: 2017-01-18
Rated 5 out of 5 by from Very good... Very good
Date published: 2017-05-09
Rated 5 out of 5 by from Great garage door insulation You can tell the sound difference with this insulation, the doors now sound solid when opening and closing. The 1.5 inch was the exact fit in thickness; I wish I would have done this sooner. I was surprised as how good it came out and how easy it was not to mention the ease of cutting the insulation with a regular sharp knife. (6) 4x8 sheets will insulate (1) 16x8 and (1) 7x8 doors.
Date published: 2015-10-20
Rated 4 out of 5 by from Nice and thick, easy to handle. I am experiencing heat gain and excessive noise on the first floor which is emanating from tenants in the basement. Previously 1/2" rigid insulation was installed which did absolutely no good whatsoever, I could hear voices clearly and the first floor was now hotter than the second floor due to the heat rising from basement so I decided to try the thickest rigid insulation I could afford and re-do the entire basement ceiling again. These 1 1/2" sheets are lightweight and were easy for an old woman to cut and install. Does it do what it was intended for? I'm going to say yes because I like to think that after spending $200.00 for anything it works perfectly... but honestly, it's too soon to tell.
Date published: 2016-08-09
Rated 5 out of 5 by from Just what I was looking for I got this to insulate my steel pole building. It went up easy and is very easy to handle. Much easier than rolled insulation and more durable, in my opinion. Used dry wall screws to attach it to the horizontal 2x6 supports. I used fender washers to prevent the screws from pulling through the insulation. I also was able to cut it to fit into the panels on the steel overhead door. Did not need to glue them in since the cross supports hold them in place so they kind of "free float" in that space. The only minor complaint is that when you cut it into small shapes, the plastic sheeting sometimes peels off.
Date published: 2015-01-13
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