Superior Energy Ratings and Air Tightness levels using SIP Panels
Frequently asked questions
Kingspan TEK® SIP Building System panels consist of a high performance fibre–free rigid urethane insulation core, sandwiched between two layers of Oriented Strand Board type 3 (OSB/3). During manufacture, the insulation core of Kingspan TEK® Building System panels is autohesively bonded to the OSB/3 facings. This process provides more reliable and superior adhesion than the secondary bonding process used in the manufacture of most other SIPS.
The Kingspan TEK® Building System comprising 142 mm thick panels can achieve whole wall and roof U–values of 0.20 W/m2.K or better with no additional insulation. The Kingspan TEK® Building System comprising 172 mm thick panels can achieve whole wall and roof U–values of 0.17 W/m2.K or better with no
additional insulation. Extremely low U–values, e.g. 0.10 W/m2.K, can easily be achieved with the addition of an insulated lining, e.g. Kingspan Thermawall® TW55, on the inside of the Kingspan TEK®
Building System panel
In addition to the excellent U–values that can be achieved by walls and roofs constructed using the Kingspan TEK® Building System, the closed cell structure of the rigid urethane insulation core of the panels does not allow movement of air within them. The insulation will not sag or physically deteriorate over time, as may be the case with other insulating materials.
The Kingspan TEK® Building System’s proprietary jointing system can create a very air–tight structure. Air leakage levels can be as good as 0.08 air changes per hour at normal pressures (approximately 1 m3/hour/m2 at 50 Pa).
Repeating thermal bridges occur where a material with a significantly worse thermal conductivity interrupts the insulation layer in a construction. U–value calculations for conventional timber frame systems take into account the effects of repeating thermal bridges, i.e. timber studs etc. The insulation layer in the Kingspan TEK® Building System is not interrupted by repeating studwork. Therefore, there is less repeating thermal bridging.
There are, however, some thermal bridges, e.g. where timbers are used to support point loads etc.
The overall result is that the Kingspan TEK® Building System only has 4% thermal bridging from timber elements for a typical domestic building wall and 1% thermal bridging from timber elements for a typical domestic building roof.
2008 BRE Green Guide Summary Ratings, for walls and roofs constructed using generic Kingspan TEK®–type SIPs, as a result of the comparatively low environmental impact of the SIPs, are heavily influenced by the external cladding specification. Wall and roof elements, constructed using the Kingspan TEK® Building System, correspond to generic elements, described in the 2008 BRE Global
Green Guide, which achieve Summary Ratings of A+ or A.
The environmental impact of the insulation core of Kingspan TEK®–type SIPs is incorporated into the generic elemental Green Guide Summary Ratings of the walls and roofs of which the panels form the basis, because it provides a significant structural function. Therefore, the Green Guide Summary Rating of the insulation core of Kingspan TEK®–type SIPs can be taken as being A+ for the purposes of BREEAM.