Insulating Roof Trusses

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

Insulating roof trusses.

Make sure it is flush against the wood as even a 1 inch gap can cause a 20 percent heating loss. Place the plastic sheeting on top of the rolled insulation. Images courtesy simpson gumpertz heger. In either case you will need to follow the general steps below to insulate your garage roof.

Like ordinary roof trusses scissors trusses come with or without a raised heel sometimes called an energy heel. With a regular roof insulation isn t a problem. For rolled insulation place it between roof rafters. Roof insulation configurations for unvented rafter truss assemblies.

Water is insulation s enemy. 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. If the plastic sheeting is in pieces overlap the pieces. 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.

If you ended up with scissors trusses without raised heels. 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. To insulate the underside of the ceiling between rafters you ll want to add insulation to the exterior portion of the finished ceiling. It creates a breeding ground for mold and mildew and ruins the air trapping pockets that block heat flow.

The bigger issue comes around when you are dealing with a roof that has exposed trusses cathedral ceilings or specialty open ceilings. Like many other building materials insulating spray foams for use on roof rafters and attic surfaces come with advantages and disadvantages. 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. If you have a flat garage roof and an attic above you can install the garage insulation from below using a standard ladder.