fisherman 72

Having just fitted a GRP deck in a boat I am aware of the cost, the roof is 16 sq m. Ply £100, GRP poss about £250. Battens would have to be screwed through the GRP, lots of holes to seal. At least with membrane I can use nail sealing tape, plus the cross battening will make a difference. I am more interested in finding any experience of the permavent products I linked.

So is there any significant problem with the idea to put DPC strips under each row of tiles, end to end, 400mm same as the tiles? As well as rectifying the membrane, battens and eaves detailing. 16 deg is well under the recommended pitch.

If I don't break too many. The cross battens will make the tiles 19mm higher than now, unless I use 50x25 rather than 38x19. I have to get under the flashing to the cottage end wall, or form a box gutter.

I'm down on the Lizard

These are for sale in Truro, expensive, and still have to work round the front roof and stink pipe. https://www.ebay.co.uk/itm/295355347548

Thanks. The original membrane is the plastic with the mesh in it, the ad was a pic of Geoff Capes standing on it between rafters, holding two rolls. Just not knowing anything at the time, stretched it tight, and may not have detailed it well at the eaves. Felt tray this time. With cross battens there will be more clearance over the wall, I may have to replace the 3in thick wall plate with thinner. The insulation is all up to scratch 250mm. Since then I got quals as a site chippy and found out how much I did that was wrong.

Yes, well versed in GRP from boatbuilding, in fact I have most of the materials to hand, but you'll appreciate I want to retain the tiles. The white stone wall is full of water. Tight membrane, water has probably blown or crept up under the tiles, and sat against the battens and come through nail holes. Possibly pooled on the membrane at the bottom as well, see when I strip it. The 400x200 tiles, now unobtainable but I can cut four from a 600 x 600 thrutone which is a good match assuming I don't break too many. Otherwise I'll use 400x250 over the whole lower section, or even a spanish slate.

Just arrived here, can I pick your brains straight off, for which I apologise. I did this low pitched tile roof over a porch, (pic below, hopefully) fibre cement 200x400 tiles, 16degs. 35 years on have leaks and rotten battens. I am going to strip it. Remove battens and tight membrane. Install slack membrane. Battens on rafters, cross battens. The question is about using one of the low pitch roof products by Permavent. There is the rubber gasket under the tile edge, https://www.permavent.co.uk/products/easy-slate/ expensive, or the plastic metre long x 220mm along the battens, https://www.permavent.co.uk/products/plain-easy/ not so deep. Or is it possible to simply cut a 400mm strip of membrane and fit it under each row of tiles? Thanks for looking, any help appreciated.

Thanks, will do, when I can crowbar granddaughter off the main PC as I can't do pics on this phone. Or maybe she will show me how to.....

Hi. I am in the wet SW of Cornwall. As my name suggests, lobster fisherman, boatbuilder, retired. Did this 1870 cottage up from near derelict in 1985. Been rectifying faults from builder friend ever since, from the inspection chamber one brick too small, to the roof tiles not quite covering the top of the wall. In 2005 got my Not Very Qualified 2 as CSCS chippy, when winter fishing got too tough for my age. Then realised how many things were wrong! Any old how, can I pick your brains straight off, for which I apologise. I did this low pitched tile roof over a porch, fibre cement 200x400 tiles, 16degs. 35 years on have leaks and rotten battens. I am going to strip it. Remove tight membrane. Install slack membrane. Battens on rafters, cross battens. The question is about using one of the low pitch roof products by Permavent. There is the rubber gasket under the tile edge, expensive, or the plastic metre long x 220mm along the battens, not so deep. Or is it possible to simply cut a 400mm strip of membrane and fit it under each row of tiles? Thanks for looking, any help appreciated.