Adding Foam Board Between Trusses In Attic Space

From what i ve been reading it looks to be ill advised to add flooring if the roof was constructed with trusses instead of rafters one such site i have no idea what these are.

Adding foam board between trusses in attic space. This is because the effects of thermal bridging are limited which also results in the elimination of melt lines on the roof surface in cold climates. If the attic is being finished for living space these pieces called scabs can be installed flush with the trusses to provide areas for sheetrock or paneling to be nailed to. Bracing for extra support pieces of 2 by 4 inch lumber are placed between the trusses underneath the decking to keep trusses straight. It comes in standard size 4 8 sheets and smaller sizes in many different thicknesses from 1 4 inch to 2 inches.

Foam board insulation is easy to use and is a great diy way to add some insulation. My thought is to add 2 inch foil wrapped foam board under the rafters. Rigid foam board under the rafter i am in a hot climate near the gulf coast in texas with the air conditioning unit is in the attic. There is a lot of space very large areas.

Wood has an r value of about one per inch of thickness. Frothpaks or 5 for 1 part foam cans. Use a zippered insulated tent to keep the enclosure draft free attic tent at 7 attic cover insulator 120. I would like to use some of my attic space for storage.

Add weatherstripping around the perimeter and a sweep to the door of a walk up attic. My attic is framed with rafters and a ridge board not with roof trusses. Pull down stair or ladder. I m concerned about ice dams forming along the eaves of my roof in wintertime.

Foam on the underside of the roof deck would provide a more reliable air seal but has long term issues related to roof rot since the unvented roof deck would get a lot of. At 600 board feet you can get the spray foam cost down to about 1 20 board foot compared to 3 35 bf ft in the 12 b f. Encapsulating the rafter or top truss chord roof framing members with spray foam will improve the energy efficiency of the attic space. Measure the length and width between two rafters in your attic and transfer the measurements to a 4 ft by 8 ft of rigid foam insulation board.

Some types of thicker foam board insulation are available but they may need to be special ordered. The space between the rafter would be left open to allow air to flow from the soffit vent to the top roof vent. 2 snap a chalk line between the length measurements. Parts of my attic are floored.