Airtightness

[nod]

We have built in block and block

No Parge coat needed 

We have just had the airtightness test While our window design of sash throughout forced on us by planners was always going to let us down

no leakage anywhere else 

Just a bit around the sash mechanism 

If you do the d&d properly there shouldn’t be any leakage around walls and cielings