Did the diverter valve sort your issue Goose? I have the exact same symptoms.
British Gas replaced the pump and the secondary heat exchanger in 3 separate visits. The pump stopped it for a while but after a couple of months it came back. They changed the exchanger yesterday and its doing error...
Do you think its kicking up too much then? Issue is the scaff has gone now!
I think splitting the difference by putting a slight raise on the first batten like you say might be the easiest way to go. Would that kick the second course too much though?
Hey guys.
I've had a nightmare with roofers recently and this is actually the second time I've had my roof done. The first was a disaster using the old tiles then this one was all new using a reputable company near me.
I'm happy with the job this company have done bar one thing I'm not sure...