Reinsulating Roof From Outside

Insulation level are specified by r value.

Reinsulating roof from outside.

Rigid insulation layers exterior to existing roof sheathing must provide sufficient thermal insulation r value to control condensation risk see climate specific guidance. The table below shows what levels of insulation are cost effective for different climates and locations in the home. The higher the r value the better the thermal performance of the insulation. The foam insulation can be put directly over the shingles or the shingles removed if there is a weight consideration.

How to insulate house walls from the outside. This video shows you how to use knauf insulation rock mineral wool rmw for sarking insulation installed above rafters and covered with homeseal lds weather. I m thinking insulated roof panels probably 4 with new metal over. Because old roofs were often framed with 2x6s.

Box out light fixtures. It typically has 3 variations. Just make sure there is no rot in the roof deck before closing that all in with nice warm insulation. It may look easy to go buy some packs of rigid insulation panels down at the.

This house is located in florida. Install nailbase for cladding. If anyone has a better idea or sees a problem with my idea i m all ears. It creates a breeding ground for mold and mildew and ruins the air trapping pockets that block heat flow.

To make installation of the foam easiest screw a board over the very bottom of the existing roof edge. Water is insulation s enemy. Install rigid insulation board in multiple layers with joints offset vertically and horizontally between adjacent layers. Rigid foam board is just above the roof deck or an exterior insulation option.

Exterior roof insulation retrofit vented roof september 17 2015 überroof. Does anyone have any experience with this or know of a source for used insulated metal roof panels. 4 strap with 2x4s and then i was considering cross strapping with 1x4s to help create better cross ventilation as on the back of the roof there are skylights and then the. I will need to insulate from the outside.

R value is a measure of insulation s ability to resist heat traveling through it. The later is used in new construction as the interior board serves as an inner wall. Bare foam board one sided sheathing board or double sided which is also reference as structural insulated panels. A site built ventilated sip roof sandwich adding exterior foam on an old roof is a good idea whenever a reroof is planned it is a once in 50 year opportunity to bring the house up to higher level of energy performance.