Should I Insulate Roof Decking In Texas

The table below shows what levels of insulation are cost effective for different climates and locations in the home.

Should i insulate roof decking in texas.

California mistakes put spray foam insulation on the bad list. Roofs are framed with rafters or trusses which are rafters joined by internal braces so they install as a single component. Best to consult with a builder. In theory adding insulation above the roof deck and then a membrane above that would help but the devil is in the details.

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. The minimum plywood for roofing. Whether or not there is an inner roof lining and the total thickness of the roof structure. In my opinion removing the old insulation should be as much a part of putting spray foam insulation on your roof deck as making sure you have whole house ventilation and conditioning the air in the attic.

R value is a measure of insulation s ability to resist heat traveling through it. Insulation level are specified by r value. Will open cell spray foam insulation really rot your roof. A roof is designed to be water tight and properly constructed and maintained it will be.

Depending on where you live and the part of your home you re insulating walls crawlspace attic etc you ll need a different r value. Rafters run from the peak of the roof. Box out light fixtures. For a correct approach an inner roof lining is required.

In texas your attic is an oven placed over your house. If the cavity between the rafters trusses is filled with insulation and is air tight like the walls you will need a vapour barrier. The technically correct approach depends on a number of factors. It creates a breeding ground for mold and mildew and ruins the air trapping pockets that block heat flow.

Like many other building materials insulating spray foams for use on roof rafters and attic surfaces come with advantages and disadvantages. The edges would need a lot of care so the membrane would have to be carried down to the wall in some way. The higher the r value the better the thermal performance of the insulation. By applying spray foam directly to the underside of the roof deck it now insulates the attic space from the extreme heat that once radiated thorough the hot shingles sheathing and roof.

Typical recommendations for exterior walls are r 13 to r 23 while r 30 r 38 and r 49 are common for ceilings and attic spaces. There is also opportunity for moisture to form due to condensation on these appliances. If your attic is often used or perhaps you plan to convert it in the future you will need to insulate the inner surfaces of the roof.