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  1. M

    What's causing this efflorescence on internal chimney stack?

    In 2023 I had a chimney leak where the chimney stack below the roof line was getting extremely damp to about 1/3rd of the way down the stack below the roof line. In Jan 2024 we had the chimney sorted; all new lead, chimney pots and cowl all checked, new concrete flaunching and all mortar...
  2. M

    Wrong headlap on low pitch roof

    Just had a small extension roof redone, pitch of the roof is 19-20 degrees. They have only done a 70-80mm headlap on each tile instead of the recommended 100mm for the pitch. Will this cause issues and should I get them back to re-do at correct headlap? Luckily haven't paid a penny yet. Roof is...
  3. M

    Marley tiles on 20 degrees pitch

    Looking to get a single storey kitchen extension re-roofed as reaching end of life. Roof pitch is 19 degrees and Marley state the modern or edgemire tile can go down to 17.5 degrees with 100mm headlap but is it wise to do it or am I better off with reclaimed welsh slate? Only issue with slate is...
  4. M

    New roof chimney leaking advice

    Just had the roof redone, slate taken off, a new membrane put down and slate put back down again. New lead on both chimneys and was all finished 25th January so had a fair few rain showers since and no leaks i'm aware of. However, just had a very heavy rainfall with some snow/sleet and have a...
  5. M

    Leak under dormer window on new roof.

    We have just had a roof replacement and the dormer re-cladded, the dormer window itself is original and was not replaced. The roof was finished last week but we have a leak under the dormer window on the right hand side into the loft so water is somehow getting under the cladding, lead and felt...
  6. M

    Slate vents installation during slate re-roof?

    We are currently having a Welsh slate roof re-done with new breather membrane, new lead flashings etc. We have an attic bedroom so have 2 small loft areas either side. There is a small bit of condensation towards the bottom of the felt, near to the gutter, but just on one side and unsure...
  7. M

    Tears in new roofing felt

    We are having our roof replaced and the roofers have now laid the new roofing felt on and battoned down and will start tiling next week. However, having looked at their work from the inside I can see 4 very small tears in the membrane. Looking outside it looks like they have used gripbond pro...
  8. M

    Condensation on new breather roofing membrane

    We are in the middle of having our slate roof replaced. They have installed a breather membrane and have put 25mm on insulation board in the rafters above our attic bedroom. I asked for 25mm as the rafters are only 75mm deep so would still leave the 50mm for ventilation. However, turns out there...
  9. M

    Damp stains bleeding through stain block.

    have 2 old chimneys and an attic bedroom which has half of these chimneys plastered with lath and plaster. Recently, these chimneys have got damp through the storms and stains showing through the paint. I have now used both Zinsser cover stain and Zinsser Bullseye 123 yet the yellowing is still...
  10. M

    Will Masonary sealer cure damp? (Ed.)

    Next week we are getting a roof replaced as its leaking like a sieve. The house was built in 1901 and still has it's 2 original Yorkshire stone chimneys. We are having issues with a damp chimney breast where the chimney bricks under the roof line are wet after heavy rain, mold starting to form...
  11. M

    chimney leak or brick saturation?

    We have an issue where a part of one of our chimney stacks just under the roof and in the loft gets wet during rainfall, it is an 121 year old house and both brick and mortar are soaking. It has been happening for a while, getting wet when raining about 4/5 bricks down, dries out when not and...
  12. M

    Leaking Dormer window a roof leak or failed window?

    We have lived in the house for 1.5 years but we had high winds and driving rain last night and woke up to water coming out of one of our attic bedroom dormer UPVC windows and down the wall, but from within the frame itself which has never happened before. The pictures below shows where the water...
  13. M

    Enough natural ventilation to create through-draft in cellar?

    Need a bit of advice: We moved into a 1901 house last year with a converted cellar done in 2020, cellar was always dry and never flooded before conversion. Within 2 weeks of moving in we had a washing machine leak so bought a dehumidifier to dry the cellar back out and since then just left the...
  14. M

    Heat recovery exchange fan or normal humidity controlled fan for cellar?

    I'm trying to control humidity and damp in my cellar and unsure whether to get a normal humidity controlled extractor fan to extractor moist air outside or get a heat recovery exchange fan to both extract moist air and bring in fresh air?
  15. M

    Ventilating a damp cellar

    I have got a tanked wall behind plasterboard with insulation in the cavity. However, it seems like I have condensation on the tanked wall and some of the insulation is getting wet so am I better to push the insulation against the tanked wall in the hope it will stop the condensation or best...
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