Pre-eighteenth century joinery was usually made of oak, but after this date most joinery, including windows, was usually made of imported pine.
Cyn y ddeunawfed ganrif derw a ddefnyddiwyd mewn gwaith coed fel arfer, ond wedi hynny pren pinwydd wedi'i fewnforio a ddefnyddiwyd mewn gwaith coed, gan gynnwys ffenestri, fel arfer.