Roof Insulation Board Thickness

So you need to know an insulation product s thickness as well as its r value in order to compare it to another product.

Roof insulation board thickness.

A layer of rigid insulation board can be added either on top of the roof s weatherproof layer or directly on top of the timber roof surface with a new weatherproof layer on top of the insulation. Meets the requirements of astm c 1177. 5 8 thickness meets the requirements of type x per astm c 1177. A flat roof should preferably be insulated from above.

Exceptional dimensional stability and rated for extreme hail rockwool stone wool insulation roof boards have meet both the fm severe hail and the ul 2218a standard for impact resistance. Achieving a u value of 0 20w m meaning your roof will be better insulated than your walls will need 120mm thickness of rigid foam or 200mm of mineral wool or natural insulation. Firestone isogard hd composite cover board is ideal for both new construction and reroof applications with available thicknesses from 1 5 to 4 two board sizes and three coated glass facers that provide mold resistance. Excellent lttr value compared to any other fm class 1 rated products of equivalent thickness.

Composed of a closed cell polyisocyanurate foam core bonded in the foaming process to 1 2 thick duraboard an expanded perlite mineral aggregate board on one side and a fiber glass reinforced facer on the other. Fm class 1 for fire barrier requirements and ul class a unlimited slope with excellent surface burning characteristics. The same insulation will hold more heat the thicker it is installed. This is best done when the roof covering needs replacing anyway.

Rigid roof insulation board. This product provides two layers of insulation installed in one application which reduces labor and material costs. Some types of thicker foam board insulation are available but they may need to be special ordered. Eight inches of poor quality insulation may have a higher and better r value than one inch of top quality insulation.

Coated fiberglass facer ideal for fully adhered systems provides a broader compatibility and higher performance with roofing adhesives. It comes in standard size 4 8 sheets and smaller sizes in many different thicknesses from 1 4 inch to 2 inches. It s light weight provides ease of handling. Hitting amazing levels of 0 13w m will need 300mm of mineral wool or 180mm of rigid foam.