The message
from "Shirl" contains these words:

Hello

My partner is building us a hardwood greenhouse. He's a dab hand at the
building side of things but we have no experience of types of glass to use
so I wondered if anyone could give us suggestions please, including ideas on
costs for a 8ft x 6ft house?

I've looked around at a few sites and it seems that horticultural glass is
popular with wooden greenhouses however these are very expensive to buy but
they dont say why they are 'better'

Aluminium frames lose more heat from the GH than wooden ones, but can
last indefinitely with no maintenance and are very easy to scrub clean
(necessary for plant hygiene). Wooden frames in the humid atmosphere of
a GH, are vulnerable to rot and insects etc so will need retreating with
paint or preservative throughout their lives, even if they are hardwood.
Remember to build in lots of adjustable ventilation.

Horticultural glass is the cheapest. When broken it makes sharp
shards. Some of the better quality GH manufacturers offer safety glass,
more expensive, but preferred by some people for the extra protection
should dogs or children run into it.

Janet