Drainage
Water collecting at the base of the PERIMATE DI-A boards must be drained away by filter drains formed with perforated or porous pipes laid above the footings or collector drains formed from perforated pipes laid in granular material (Figure 2). Depending upon ground conditions drains may be connected to surface drainage systems or soakaways.
Thermal performance
Methods for calculating U-values for basements are given in BS EN 13370 and the Approved Document 'Basements for dwellings'. For assistance with U-value calculations contact Dow Building Solutions by calling 020 3139 4000 or by emailing fkltech@dow.com.