Pre-bonded systems for flat roof applications can extend the life of a building and are quicker and cheaper to install than multi-layer alternatives
Correct specification is everything when it comes to selecting an appropriate roof insulation system; one that endures a building’s lifespan through all weathers.
When installed as part of a flat roof’s waterproofing build-up, tapered insulation enhances a building’s overall thermal performance and manages a roof’s water run-off. If water is not properly dispersed from a roof its weight leads to deflections forming, increasing the risk of ponding and water-based structural damage.
Selecting a system that is specifically designed to suit a particular application is important because it can extend the life of a building.
Single or multi-layer insulation?
Single-layer tapered insulation systems are bonded under factory-controlled conditions and are ready to install once delivered to site. Multi-layer options need to be bonded and installed layer by layer.
The insulation within the single-layer bond will have been monitored for its volume and minimum pull-off performance, leaving installers with the relatively straightforward task of adhering it - in one block - to the roof, followed by the waterproofing. This guarantees the insulation will perform as designed and significantly reduces application times and material waste.
Multi-layer might appear to be more cost effective than pre-bonded single-layer, but the benefit is negated by the additional hours it takes to install.
Why a site survey is crucial
A site survey ought to be a prerequisite when specifying tapered insulation for flat roofs, particularly for modular single-layer systems, which can't be cut or altered once delivered to site.
A survey will determine a roof’s dimensions and take into account potential obstructions or openings such as rooflight and drainage outlets, which could affect the layout of a bespoke-designed insulation scheme.
Refer to industry guidance
The Single Ply Roofing Association (SPRA) code of practice has excellent guidance on specifying insulation systems that meet industry standards for water run-off, pitch size, wind load calculation, falls and weight ratio.
Also useful for performance requirements across a range of applications is BS 6229:2018, the standard that defines best practice in flat roof design and maintenance.
Get the help of experts
Quality is built in with single-layer tapered insulation systems. Insulation specialist Gradient, for example, provides a turnkey service as part of its bespoke manufacture of flat roof and tapered roofing insulation systems.
From initial consultation and pre-design to installation and beyond, Gradient’s technical team works alongside clients to ensure the success of its bespoke tapered insulation schemes. Gradient solutions are produced to ISO 9001, one of the most widely adopted management standards in the world.
For more information and technical support, visit gradientuk.com