Insulating A Low Slope Roof

He plans on replacing the low slope built up roof with an epdm membrane and the question is how to insulate it correctly.

Insulating a low slope roof.

Some assemblies included a high density hd polyiso board at the deck level. Box out light fixtures. Dual purpose structural deck and insulating planks. Ideal for low slope roofing.

The insulation used in low slope roof assemblies typically falls into one of the four categories. Lightweight insulating concrete lwic. Insulating a low slope shed roof learn 5 reliable ways to build an energy efficient flat or shallow pitched unvented roof which is much easier and less risky than building a vented one. Insulfoam single ply sp fire rated single ply roof insulation with factory laminated glass facer.

Unvented roof assemblies should be insulated either with air impermeable insulation rigid foam or spray polyurethane foam or with a combination of foam and air permeable insulation. Common low slope roofing assembly. It is made from. Rigid board insulation rigid board insulation is the most common type of insulation used in low slope commercial roofing.

Insulating a cool self drying vented low slope roof i own a mid century modern home in the seattle area with a 1 12 pitch roof over vaulted ceilings separated by 2x6 joists with r13 batt insulation venting at the soffit and ridge and a condensation issue that started after the modified bitumen roof was replaced last june with a white tpo. Eric dymond lives in a 1920s baltimore row house that needs a new roof. If you don t want to use sips or nailbase read this article tolearn the four basic approaches to insulating unvented roof assemblies. Or sprayed polyurethane foam spf.

By martin holladay issue 250 april may 2015. Currently the built up asphalt roof is installed over homasote or something similar and a roof deck made of wood planks. Look for water stains on the roof sheathing or damp or moldy spots on attic joists and existing insulation as a clue to where leaks might be. Such roofs are generally considered to have a slope of less than 2 12.

It creates a breeding ground for mold and mildew and ruins the air trapping pockets that block heat flow.