Loft conversion - rotten timber?

[Firsttimereno]

We’re having a loft conversion done and noticed one of the timbers used appears a bit rotten? Should we ask for this to be changed? 

[Marvin]

How deep are the joists.

 

How deep is the hole.

[ToughButterCup]

I don't think that's rotten.

If that timber has the same grading stamp as the one next to it - '.... CE [...] CERTIFIED  UK ' etc. then don't worry.  You might want to double - up  (sister) that timber though out of caution.

[joe90]

+1 that’s rot, Just a natural defect in the tree and I wouldn’t worry about it, timbers are always over sized.

Edited January 12 by joe90

[ProDave]

If I had received that bit of timber from the merchant, I would either have rejected it, or chosen to use that particular piece in a place where it was being cut into short lengths.  Same as I do for a warped bit of timber.

[Russell griffiths]

The timber should all be graded either c16 or c24 the grading takes place and the timber is marked up to state it’s grading. 
 

if this looks like damage that was caused as the tree grew then it was graded then it’s fine it passed, if it looks like damage caused by the guys on site after it was graded, then it’s fine would now be below grade and should be changed. 
 

that looks like a natural anomaly as the tree has grown so as long as it’s got it’s correct markings on it, it should be fine. 

[saveasteading]

That never passed a grade test by machine or inspection.

I was told by a timber importer that they had quality issues with Russian timber where rotten timber would be concealed in the centre of a bundle.

The strength grading would be dubious too, and I think the merchant did their own grading.

That would be 1990s.

Maybe one of those.

 

 

[MortarThePoint]

Looks fine from what I can see. What span are the joists, what size timbers and what spacing. Looks like it may be 47mm x 145mm or 47mm x 195mm at perhaps 400mm spacing. You can then use the tables here to check all good:

 

https://nhbc-standards.co.uk/6-superstructure-excluding-roofs/6-4-timber-and-concrete-upper-floors/6-4-8-timber-joist-spans/

 

You may find if you look up the next size down in the table, so allowing 25mm for that defect, you are still fine. As an example, if C24 on a span of 4m, spacing 400mm and timber 47x195 then 47x170 timbers would still be OK for that. That would allow the whole lot to be smaller, so just one would be super OK.

 

In the photo, the defect doesn't look as deep as 25mm, but check by eye.