Timber Frame and Rain

[fzx5v0]

Hi, I have had a timber frame house with 9mm OSB board exposed to the rain since December 2019. There is large voids for windows, bi-fold doors and roof is partially boarded. The delay is due to bad weather and Covid.

I am about 7 weeks away from wind and water tight

Here is a photo of the OSB board. I am just concerned that I may need to replace alot of the frame and do not know how much risk I am carrying.

 

[big-all]

is that osb exposed to the element or just sitting in water ??

 

[fzx5v0]

is that osb exposed to the element or just sitting in water ??

That is under the wrap the water is coming through the board from the inside due to some of the roof not being on. Also all of it does not have wrap on it, going to try sort that at the weekend. The OSB is not sitting in water just exposed to elements in parts and some edges.

 

[^woody^]

Oh dear.
The thing with osb is that it's hard to see if the stands have weakened. The board itself is largely water resistant (not proof) but this relies on it drying off between soakings, but the edges are more susceptible to weakening and wetting - and these are the important areas to brace the frame.

I'd contact the OSB makers rep - not the supplier, the maker who supplies to the merchants.

The frame itself may be ok, but will be subject to shrinkage movement. Again, speak with the frame supplier.

 

[fzx5v0]

Oh dear.
The thing with osb is that it's hard to see if the stands have weakened. The board itself is largely water resistant (not proof) but this relies on it drying off between soakings, but the edges are more susceptible to weakening and wetting - and these are the important areas to brace the frame.

I'd contact the OSB makers rep - not the supplier, the maker who supplies to the merchants.

The frame itself may be ok, but will be subject to shrinkage movement. Again, speak with the frame supplier.

Will speak to OSB manufacturer but can not speak to frame company as that is me.

There is plenty of air flow and it is not lying in water so hopefully be OK

 

[big-all]

my thoughts are if the osb is getting weather for more than a few weeks its prudent to change it
as in your situation its sounds like months on end then i think i know what i would do??
do you have a dry offcut thats been no where near water ??
if so i would remove say the bottom 8" from a well stained board compare thickness and with similar size bits try the Weetabix test for possible comparison to strength

 

[fzx5v0]

my thoughts are if the osb is getting weather for more than a few weeks its prudent to change it
as in your situation its sounds like months on end then i think i know what i would do??
do you have a dry offcut thats been no where near water ??
if so i would remove say the bottom 8" from a well stained board compare thickness and with similar size bits try the Weetabix test for possible comparison to strength

It does not look like it has swelled and still 9mm so hopefully the air going through is drying it out quickly when it gets wet