we use Accoya as the standard timber for all our box sashes, you get a
better all round end product. Our windows come with a guaranteed
durability for 50 years, no questions asked. There’s also a 75%
reduction in swelling and shrinkage, so they’ll withstand more than your
average window. And, because Accoya is non-toxic with superior
resistance to UV exposure, it’s naturally insulating too.