Insulating A Low Slope Roof

Ideal for low slope roofing.

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. Currently the built up asphalt roof is installed over homasote or something similar and a roof deck made of wood planks. Common low slope roofing assembly. Dual purpose structural deck and insulating planks.

Lightweight insulating concrete lwic. Some assemblies included a high density hd polyiso board at the deck level. Or sprayed polyurethane foam spf. Insulfoam sp is an engineered insulation consisting of a superior closed cell lightweight and resilient expanded polystyrene eps with a durable and stable factory laminated coated glass facer.

Rigid board insulation rigid board insulation is the most common type of insulation used in low slope commercial roofing. Eric dymond lives in a 1920s baltimore row house that needs a new roof. 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. 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.

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. It is made from. Such roofs are generally considered to have a slope of less than 2 12. By martin holladay issue 250 april may 2015.

If you don t want to use sips or nailbase read this article tolearn the four basic approaches to insulating unvented roof assemblies. The analysis was done for an assembly consisting of a steel deck two layers of polyisocyanurate foam insulation polyiso and tpo single ply membrane. Water is insulation s enemy. 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.

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