A
Anonymous
Guest
I have some water ingress around a chimney breast. As far as I can tell the slates on the roof are ok as is the lead flashings. The roofer is going to rebed the ridge tiles as the mortar looks a bit dodgy, however he suggests a fibreglass membrane around the top of the chimney stack. The cottage (and chimney stack) is stone built (these old cottages are built of a stone/rubble and what was a form of mortar which quite frankly looks more like earth after all this time). The cottage is painted and the top of the chimney stack is concrete rendered to form a dome with the chimney pot sticking out from that. This flaunching looks ok - no cracking or anything. The chimney pot has a half tile bonnet cap. The chimney is in use - it has a wood burner and the chimney was lined some years back.
My question is - has anyone any experience of fibreglass membranes used in this way? The roofer's view is that the stonework is now porous and letting in water and the membrane is a 'common' solution is such a problem. I've never come across it (but that doesn't mean anything!) and am a little uneasy using something that doesn't breathe. The roofer says that it acts like an umbrella and that the stonework will eventually dry out over a period of months.
My question is - has anyone any experience of fibreglass membranes used in this way? The roofer's view is that the stonework is now porous and letting in water and the membrane is a 'common' solution is such a problem. I've never come across it (but that doesn't mean anything!) and am a little uneasy using something that doesn't breathe. The roofer says that it acts like an umbrella and that the stonework will eventually dry out over a period of months.