R ValuesR Values
What does the R Value mean
R-Value is the rating system used to grade insulation products or a material's insulating properties. The “R” stands for “resistance” and refers to the resistance a material has to heat flow, or temperature conduction. When a product or home has a high R-Value, this means it is well insulated.

All our windows come with toughened low e glass and argon filled as standard, with an R value in excess of the new amendment to:-
" H1 Energy Efficiency for all Housing & Building's up to 300 m2".