Tyvek Siding R Value

When installed tyvek thermawrap adds an effective r value thermal resistance equal to r 2 r value.

Tyvek siding r value. Based on sophisticated building science dupont s tyvek thermawrap r5 0 delivers the benefits of a weather barrier along with an insulation value of r5 0 in a single integrated product that can be installed using familiar installation techniques similar to those for dupont tyvek homewrap. And just like air gets in so can water and moisture. However properly installed tyvek weather barriers help protect against loss of r value in insulation due to wind washing. Installed r value includes the whole wall system with studs sheathing board insulation and siding and takes wind movement into account.

That said adding 1 2 to 1 of foam insulation board over sheathing and under siding will do much much. Even at wind speeds of 5 mph a wall without an air barrier retains less than 40 of its original installed r values. It also means that your insulation won t lose any of its r value due to air infiltration. Energy loss can be a serious problem for many.

Dupont tyvek homewrap gives you the added benefit of helping to protect your walls from water and moisture. In the event of a delay or break in the project your house wrap may need to be redone before siding can be installed. In texas homes this can help reduce energy usage and costs for heating and cooling systems year round. Tyvek is not designed as a product for older homes.

Dupont tyvek homewrap is designed to help block air from getting inside walls. The average wall has 3 5 inches of insulation with an installed r value of r 14 under ideal conditions. Many people are familiar with tyvek. Properly installed it helps keep drafts out and protects your insulation s rated r value.

Tyvek is designed for new homes only.