Flat and dense, crumb rubber is good for heavy footfall – offering maximum protection but a little less comfort (and very good over stair nosings).
The market’s most popular underlay is available in flat or waffle patterns in a wide range of weights for different applications. It performs well for comfort and has a durable spring retention.
PU (polyurethane) foam
PU foam is a relative newcomer to the market, typically made from recycled foam offcuts. The foam provides excellent comfort and performance levels with lots of thickness options and densities – and its light weight helps handling. The product can be recycled again after use.
A rubber crumb base with a felt top layer offers a good combination of protection, durability and comfort. It also allows carpet with seaming to bed into the top felt.
Underfloor heating underlay
Always ask if there is underfloor heating. Most manufacturers offer specialised products. Underlay and carpet with a combined tog rating up to 2.5 can be used – which means the underlay would normally have a tog rating of 1.0.
This traditional (but environmentally friendly) underlay is made from recycled fibres – wool, jute and synthetic – to create a firm, dense pad with excellent thermal insulation. Still a very popular choice among contractors when stretch fitting woven carpets.
A self-adhesive single stick underlay in both needlefelt and PU. A removable system for heavy use when comfort is desired.