Insulation Directly Under Roof

When installing a foil faced foam board insulation.

Insulation directly under roof.

The old insulation could be removed. The 6 inches of rigid insulation added to the top of the existing roof deck needed to be done in a manner that was invisible. The material is compressible and is thus easy to fit and is less likely to cause cracks. Baffles can be installed and the foam can be sprayed in.

The insulation boards are best fitted under the roof structure whilst the mineral wool can be inserted between the beams of the roof. Like spray foam rigid foam provides an air and moisture barrier as well as high r value insulation. The airflow from the soffits to the ridge vent keeps the roof cool and prevents ice dams and the material will block that flow. The movement of air into indirect conditioning of an unvented attic is a slow gradual process that will not be noticeable by occupants and typically will not put any strain on the hvac system.

Vented attics that are insulated over the ceiling deck with increased amounts of blown fiberglass or blown cellulose. High efficiency and ultra efficient attic insulation systems include. Going back to the moisture which develops under the underlayment if this moisture has nothing to dry it out air movement under the roof deck you have a problem and having an insulation directly under it exacerbates the problem because any moisture will expand in high heat conditions. This underlayment goes great under metal tile slate standing seam and other metal and tile roofing systems that have a batten system or a naturally occuring air space between the roofing material and the deck.

This can be hard with roofs which are not a straight plane down. In addition to installing the foam board on the underside of the roof deck you can attach it to the bottom edges of the. Get the right attic roof insulation for your home don t guess about attic roof insulation. The roofingfoil underlayment is miami dade approved for use in roofing.

I think the best time to have the job done right is when you are putting on a new roof this includes the sheathing. Foam insulation may be the best idea but this can be costly. Staple plastic or foam baffles to the roof sheathing near the eaves to keep the material away. The trim the frieze boards the fascia and the overhangs all had to look like they belonged.

They had to look original. When installing rigid insulation in an attic to be finished as a living space you must provide a route by which hot air. Unvented attics that are insulated on the underside of the roof deck with blown spray foam. But spray foam insulation used at the underside of the roof deck would need to be covered by a thermal barrier and intumescent coatings are commonly used.

Moreover you lose less space. For the same reason insulation shouldn t touch the roof s underside.