Roof Substrate Definition

Roof substrates otherwise known as roof decking or rigid sarking support other roof elements such as vapour control layers insulation and roof finishes.

Roof substrate definition.

Fasteners and clips would be attached into the substructure. Deck substrate a roof deck is a roofing material layer installed on top of the rafters and right under the insulating layers of underlayment. Roof substrate movement is a condition where the substrate or roof deck in residential properties expands and contracts. In construction a roof deck is also known as sheathing or substrate.

What causes roof substrate movement. It often is used in part to support vapor retarders and air barriers. In this blog we look at the causes of roof substrate movement. There are many different types available including options for green roofs and fsc sustainably sourced and produced types.

The surface upon which the roofing or waterproofing membrane is applied e g in roofing the structural deck or insulation. This causes the decking material to buckle or have gaps that can result in conditions that may require major roof repair. An intentional depression around a roof drain or scupper that serves to promote drainage. For the purpose of this article we will define the substrate board as the material that is placed upon the roof deck prior to the placement of thermal insulation.

A substrate is the surface upon which a roofing system is applied. It acts as a base to which the metal roof material is attached securing the fasteners and clips used to hold the panel. It can be the roof deck an insulation system or a complete preexisting roof system. When shopping for metal roofing purchasers must be vigilant to ensure the substrate and coating on the metal panels they choose will match their long term performance expectations.

The sizes and proportions of small particles and their packing inside the large pores make a major contribution to the amount of water the mix can retain. The substrate or decking material typically plywood or oriented strand board osb expand and contract when exposed to heat resulting in roof substrate movement. The exposed portion of strip shingles defined by cutouts. Green roof growing substrates are designed to have a mix of large and medium sized particles to create an open porous structure inside which smaller particles can fit.

If these substrate panels are installed too close to each other they could push into each other as they expand from the heat resulting in buckling. As a key part of the metal roofing system the substrate or substructure which rests underneath the metal roof panels serves two main functions.