Daltonia Posted September 30, 2016 Report Share Posted September 30, 2016 My mushrooms, on a boat that is two years old, appear to be leaking (see first image). It doesn't appear to be condensation. All five mushrooms have this problem. After rain, a film of water collects at the base of the mushroom (see second and third images). I'm not sure if it is ingress through siliconed seals at the base of the mushrooms or along the lines of the attachment bolts, perhaps both? I would appreciate any advice on how best to solve this problem. Link to comment Share on other sites More sharing options...
Top cat Posted September 30, 2016 Report Share Posted September 30, 2016 I use "Captain Tooleys Creaping Crack Cure" for various leaks round the boat, it does what it says on the tin ( bottle actually). Top Cat Link to comment Share on other sites More sharing options...
rusty69 Posted September 30, 2016 Report Share Posted September 30, 2016 I too have used creaping crack cure with success. Could you try pouring some water on one of them to see where its coming through? Link to comment Share on other sites More sharing options...
Northernboater Posted September 30, 2016 Report Share Posted September 30, 2016 (edited) The only thing to do with leaky mushrooms is remove, dress the rust, paint, re-seal and re-install also putting some seal on the screw threads to seal those too, but the seal looks ok with no rust tails on the seal/roof edge, This may be that the seal was only put on the outside edge of the mushroom and not on the inside/hole edge hence no rust on the roof with the water escaping to the inside/hole edge. It may just be the water slowly leaking through the screws due to water build up in the hole recess and the only way it can go is to the inside. Try removing the screws to see if their rusty? If so re-screw with sealent on the screws and threads to form a seal here too. I get water coming in sometimes when it is heavy rain hitting the roof at an angle and all I can put it down too is the rain bouncing up from the roof and getting caught by the underneath of the mushroom. and then dripping on the inside. Edited September 30, 2016 by Northernboater Link to comment Share on other sites More sharing options...
ditchcrawler Posted September 30, 2016 Report Share Posted September 30, 2016 I would say the water is entering around the bolts. as above, take them off fix the rust and then bed them on a mastic type material putting the bolts through it Link to comment Share on other sites More sharing options...
Plonk Posted September 30, 2016 Report Share Posted September 30, 2016 The only thing to do with leaky mushrooms is remove, dress the rust, paint, re-seal and re-install also putting some seal on the screw threads to seal those too, but the seal looks ok with no rust tails on the seal/roof edge, This may be that the seal was only put on the outside edge of the mushroom and not on the inside/hole edge hence no rust on the roof with the water escaping to the inside/hole edge. It may just be the water slowly leaking through the screws due to water build up in the hole recess and the only way it can go is to the inside. Try removing the screws to see if their rusty? If so re-screw with sealent on the screws and threads to form a seal here too. I get water coming in sometimes when it is heavy rain hitting the roof at an angle and all I can put it down too is the rain bouncing up from the roof and getting caught by the underneath of the mushroom. and then dripping on the inside. I would agree. I refitted my 4 on my boat a year ago. Admitted, Dreadlocks is 17 tears old and the rust had expanded the joint and snapped the heads off most of the screws! Link to comment Share on other sites More sharing options...
Bee Posted September 30, 2016 Report Share Posted September 30, 2016 Northern boater is right, take 'em off, then get some thin rubber sheet stuff off e bay, make a gasket and bolt right through. Job done Link to comment Share on other sites More sharing options...
BruceinSanity Posted September 30, 2016 Report Share Posted September 30, 2016 Or get some Sikaflex and both bed the mushrooms in it and apply to the screws to seal the threads. Beware of over tightening the bolts, brass screwing into steel shears very easily. Link to comment Share on other sites More sharing options...
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