Chemical Attack

I have lost count of the number of times that this phenomenon has been wrongly diagnosed as fungal decay and it is easy to see why. This short video should give the less experienced surveyors a better understanding of this issue should you come across it in the future.

[@ben_tyreman]

it's a good idea to hot limewash the beams as well, it helps prevent further rot.

[@yvonfem]

If the surveyor thought that was fungal decay he must have gone to specsavers

[@over-engineered]

I have a couple of similar white patches on rafters by the side of my chimney in my loft. 1960 concrete tile roofed house, but leaks occasionally when hit by driven rain on the exposed side (can see the sea to the south west). Would this be salts out of the mortar joints and parging on the chimney I wonder. They did use Lime in the mix.

[@timconnors5216]

This is excellent. Thank you (again), Neil.

[@simonsee2483]

Excellent explanation, thank you for uploading

[@Mr27363]

You are very welcome Simon, I am delighted that you found it to be helpful. Regards Neil

[@alialtun289]

Brilliant video

[@Mr27363]

Thank you Ali, I am delighted that you found it helpful. 🤝

[@Vecinu0]

Hi Neil,
I got a similar issue on my roof, but no chemical attack or decay on timber, or mold, just lime mortar falling off.
Do you think redoing the torching under roof tiles will help prolong the life of the roof? Also timber should be painted with acrylic waterproof paint?
Thanks

[@stevenewbank]

Retorching is a good idea. Never paint anything lime based or touching lime with acrylic paint as it sweats. Hope this helps.