Pre-bonded insulation systems protect buildings through all weathers and are quicker and cheaper to install on site than multi-layer alternatives
Tapered insulation is installed as part of a flat roof’s waterproofing build-up. Its multifunctional design enhances a building’s thermal performance and manages a roof’s water run-off to ensure it flows into the appropriate outlets or gutters.
If water is not properly dispersed from a roof, its weight will lead to deflections forming and increase the risk of ponding and water-based structural damage. A well appointed tapered insulation scheme can extend the life of a building so selecting a single-layer or multi-layer system specifically designed for a particular application is important.
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.
Should I choose a single or multi-layer insulation option?
Single-layer tapered insulation systems are bonded under factory-controlled conditions. They are ready to install once delivered to site so are a time and cost-effective alternative to multi-layer solutions.
The insulation within the single-layer bond is monitored for its volume and minimum pull-off performance. It is then installed - in one block - to the roof, followed by the waterproofing. This not only guarantees the insulation will perform as-designed, it significantly reduces application times and material waste.
A multi-layer solution might appear to be a more cost-effective option, but the benefit is negated by the additional time it takes to bond and install the insulation layer-by-layer. This process is eliminated with a pre-bonded single-layer system.
Is a site survey always necessary?
A site survey ought to be a prerequisite when specifying tapered insulation for flat roofs. In many instances, the initial take-off drawing/specification of a project will differ from what is the reality on the ground. Surveys are particularly important 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. It can also take into account any backfalls or deflections that need to be overcome.
Call in the help of experts
From a specification point of view, quality is built-in with single-layer tapered insulation systems. Gradient, for example, provides a turnkey service as part of its bespoke manufacture of flat roof and tapered roofing insulation systems.
From consultation to project completion, Gradient’s technical teams work alongside clients to ensure the successful implementation of its individually tailored tapered insulation schemes. Each bespoke solution is produced to ISO 9001; one of the most widely adopted management standards in the world.
For more information and technical support, visit gradientuk.com