Built a hipped porch roof this summer according to the following principle:
Tongue and groove boards
Roofing felt
Top felt
The roof has since been insulated with a 25 mm air gap between the tongue and groove boards and the insulation. I have not yet clad the roof overhang (as electrical wiring for spotlights in the eaves needs to be installed) so I can see the underside of the tongue and groove boards.
A few boards there show clear signs of mold? When I removed the insulation, I saw the same phenomenon in one spot in the middle of the roof too?
Why is this happening, it almost looks like some boards were already affected from the start?
What should I do about it? For obvious reasons, I can't replace the boards, can I apply some treatment that slows it down or is it nothing to worry about?
Grateful for advice!
Best regards,
Nicklas
Tongue and groove boards
Roofing felt
Top felt
The roof has since been insulated with a 25 mm air gap between the tongue and groove boards and the insulation. I have not yet clad the roof overhang (as electrical wiring for spotlights in the eaves needs to be installed) so I can see the underside of the tongue and groove boards.
A few boards there show clear signs of mold? When I removed the insulation, I saw the same phenomenon in one spot in the middle of the roof too?
Why is this happening, it almost looks like some boards were already affected from the start?
What should I do about it? For obvious reasons, I can't replace the boards, can I apply some treatment that slows it down or is it nothing to worry about?
Grateful for advice!
Best regards,
Nicklas
That's how it looks for me too. Built (or building) a "friggebod" last fall. Rough plank with felt on top.
My theory is that the extremely humid and rainy late autumn has made mold grow on untreated wood. I blame the fact that only certain planks have been affected on the likelihood that they had a slightly higher moisture content from the start. Maybe they were at the bottom or top of the stack at the warehouse?
I’m not quite sure what to do either. I was planning to paint it in the summer. Spray on some Boracol and scrub. Then paint according to all the rules of the art. That's probably what I was thinking of doing unless a better suggestion comes up.
My theory is that the extremely humid and rainy late autumn has made mold grow on untreated wood. I blame the fact that only certain planks have been affected on the likelihood that they had a slightly higher moisture content from the start. Maybe they were at the bottom or top of the stack at the warehouse?
I’m not quite sure what to do either. I was planning to paint it in the summer. Spray on some Boracol and scrub. Then paint according to all the rules of the art. That's probably what I was thinking of doing unless a better suggestion comes up.
It depends a bit on how they are positioned in the drying kiln at the sawmill as well. When they dry, the moisture carries nutrients from the core to the surface. Some boards then become more favorable for growth than others.
The same here, both on gaps and individual boards.
I think it depends on how it has been stored at the lumberyard and the construction site, those that have been on the bottom of the stack have been exposed.
I've checked on them a few times, and it's not growing, so I believe that the growth has been there the whole time.
I think it depends on how it has been stored at the lumberyard and the construction site, those that have been on the bottom of the stack have been exposed.
I've checked on them a few times, and it's not growing, so I believe that the growth has been there the whole time.