Rigid Insulation Roof Sheathing

Request a product sample where to buy contact a rep.

Rigid insulation roof sheathing. The glass fiber reinforcement contributes to improved fire performance and dimensional stability. Install nailbase for cladding. You can even place it under the foundation slab. Rigid foam insulation also known as insulating boards provide high r values.

Install roofing underlayment flashing and cladding as per best practices. Thermax sheathing is a non structural rigid board insulation consisting of a glass fiber infused polyisocyanurate foam core laminated between 1 0 mil smooth reflective aluminum facers on both sides. Exterior rigid foam improves air tightness adds r value reduces the chance of condensation in wall cavities and greatly reduces thermal bridging through studs. Installing rigid foam insulation on top of roof sheathing is a great option for commercial buildings and homes with limited space.

Polyiso consists of a uniform closed cell polyisocyanurate foam core and provides one of the highest r values per inch of any rigid insulation. Install it anywhere from the roof to the foundation. Nailbase must be vented in high snow load areas. Zip system r sheathing is the simple all in one structural panel with built in exterior insulation.

The boards are available in several thicknesses and r values. They keep your home at a comfortable temperature without the need to crank your heat. Foam board sheathing insulation johns manville polyiso foam sheathing insulation boards provide a continuous layer of insulation to reduce thermal bridging and improve energy efficiency. Rigid insulation is one of the best tools to reduce your energy costs.

Rigid insulation sheathing is made of a rigid plastic foam that is typically sold in 4 8 or 4 10 foot boards. Rigid insulation layers exterior to existing roof sheathing must provide sufficient thermal insulation r value to control condensation risk see climate specific guidance. Box beam gable framing new gable overhang is framed in the form of a box beam hanging off of a new layer of roof plywood roof sheathing cantilevered over the top of the 3 layers of rigid insulation. 1 inch and 2 inch thicknesses are common.

Rigid insulation provides thermal protection and it can also serve as an air and moisture barrier. The exposed edges of the 3 layers of rigid insulation are to be sealed with another layer of membrane. Not only that foam sheathing will soon be mandated by code in some climate zones. The purpose of the requirement that rigid foam installed above roof sheathing meet certain minimum r values is to ensure that the roof sheathing stays warm enough during the winter to avoid moisture accumulation and possible sheathing rot.