Norfolk Frames systems uses a patented and unique reinforcing system - Thermlock® - which provides greater strength, better window security and better thermal performance than traditional reinforcing.

Conventionally reinforced three chamber profiles struggle to beat the 2.0W/m2K requirement under current Part L regulations (England) and Park J (Scotland).

Beats 1.8W/m2K

a part J (Scotland) requirement since March 2003 without the need for costly soft-coat glass.

35% stronger than standard aluminium

on deflection strength.

900% better than steel

on torsion strength

20% more secure windows

screw pick up ridges make fixing easier. Thermlock delivers 20% greater pull-out strength on handles, keeps, shootbolts and hinge fixings.