How To Insulate Garage Roof Trusses

Insulating a 2 x 4 garage roof its a pre fab garage shed 14 ft wide.

How to insulate garage roof trusses.

With a regular roof insulation isn t a problem. However if you have a cathedral style garage roof you will need a scaffolding to get into the upper areas of the roof. If you re unfamiliar the storage truss is framed using 2 4 with another interior triangle made of 2x3s and about 5ft headroom. The tape will also make sure that there is an air pocket available in the insulation.

To insulate the underside of the ceiling between rafters you ll want to add insulation to the exterior portion of the finished ceiling. To install the insulation overhead you need to staple the pieces to the roof trusses. You should use some foil tape to make sure that the insulation is stable on the roof edges. Most of the house will have scissor trusses 8 12 pitch upper and 4 12 pitch lower.

Insulating the ceiling is the most important part of the garage because heat rises and escapes through the roof. The garage is free standing not attached the previous owner used this property as a vacation rental and walled in one bay of the garage up to the trusses presumably for personal storage. Insulating a garage door can be more involved than insulating the walls and ceiling. Similar to wearing a hat in the winter you need to make sure the top of the garage is protected to trap the heat in.

The roof is half storage truss and half vaulted scissor truss. There are many methods that you can use for insulating garage roof trusses but the most popular one is definitely the foam board. The bigger issue comes around when you are dealing with a roof that has exposed trusses cathedral ceilings or specialty open ceilings. I would like to keep the full height inside and not frame anything flat across to form an attic space.

Make sure that all of the pieces are the same size so that they fit into the trusses. I would like to insulate against the roof deck with vent chutes. I am going to build a new home in northern idaho zone 5. That s the wall you see in one of the pics.

Roof framing is 2 x 4 with plywood gussets sandwiching each ridge joint and every fourth or fifth is a collar tie attached with gussets also. I am planning on insulating and finishing the outside walls. I originally thought of closed cell spray foaming the entire underside of the roof deck for an unvented attic space. With the exception of two shed dormers that will be stick framed.

In either case you will need to follow the general steps below to insulate your garage roof. Insulating garage roof trusses. If you have a flat garage roof and an attic above you can install the garage insulation from below using a standard ladder. How to insulate a garage door.