Insulating Roof Trusses

Then feed the rolled insulation under wires and pipe if either is present.

Insulating roof trusses.

Roof insulation configurations for unvented rafter truss assemblies. With a regular roof insulation isn t a problem. Senior engineer manager at icynene john broniek makes the case for the unvented attic assembly and why insulating the underside of the roof makes sense. Water is insulation s enemy.

It creates a breeding ground for mold and mildew and ruins the air trapping pockets that block heat flow. Make sure it is flush against the wood as even a 1 inch gap can cause a 20 percent heating loss. The quest for greater energy efficiency in buildings has led to increasing interest and need for insulation improvements in hvac equipment more airtight construction new materials and assemblies. The relatively costly application for example can also save money by lowering your energy bills and enabling you to add your own insulation with a contractor s help.

However if you have a cathedral style garage roof you will need a scaffolding to get into the upper areas of the roof. To insulate the underside of the ceiling between rafters you ll want to add insulation to the exterior portion of the finished ceiling. If you have a flat garage roof and an attic above you can install the garage insulation from below using a standard ladder. Like ordinary roof trusses scissors trusses come with or without a raised heel sometimes called an energy heel.

Place the plastic sheeting on top of the rolled insulation. Ibc dictates acceptable placement and composition of roofing materials in chapter 15 but describes required thermal efficiency of the roof in chapter 13 which references the international energy conservation code iecc the minimum required thermal resistance varies. Images courtesy simpson gumpertz heger. If the plastic sheeting is in pieces overlap the pieces.

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. For rolled insulation place it between roof rafters. Like many other building materials insulating spray foams for use on roof rafters and attic surfaces come with advantages and disadvantages. The bigger issue comes around when you are dealing with a roof that has exposed trusses cathedral ceilings or specialty open ceilings.