How To Reinforce This Floor Joist?

[Spuggy]

Hi,

Another joist problem in our 1950's house.

Pulled down fibreboard and taped ceiling to replace with boards and found this split and knot in the first joist. The split is about 1m from the end. It runs over, but doesn't sit on the wall in the pic (and the wall is coming down anyway). No movement can be seen with weight moving about above (daughter's bedroom), but it kicks up about 5mm from this point as it enters the cavity.

Because it runs alongside a supporting wall, I'll struggle to sister and bolt it. Any ideas?

Cheers.

 

[Ian H]

Double/triple it up once the wall has gone?

 

[geraldthehamster]

I'd be inclined not to worry too much about it. Does the supporting wall alongside it continue in the upper room? If so there won't be a lot of jumping about on it.

If you are worried, maybe you could drill right through it into the supporting wall, and resin in some studs?

 

[^woody^]

Nope, can't see a problem. Is it that big knot?

 

[geraldthehamster]

It looks like a big knot with a shake above it. The timber has probably flexed marginally at the knot.

 

[Spuggy]

Yes, it starts kicking up from the knot until it enters the cavity about 1m off to the left of the pic.

 

[tony1851]

Not really a problem; timber is graded and factors of safety are inbuilt into the strength assumptions. Knots are allowed for.

 

[oldbutnotdead]

You could use a nail repair plate if you're worried or get a lump of plate steel and some coachscrews and do it that way. But as long as you're not putting the team bath on top of it it'll be fine

 

[martygturner]

looks like 6x2 so polyurethane glue and coach screw a 5x2 along its length, stitch the screws at 100mm centres top 1/3rd bottom 1/3rd alternating ... 6x90 screwfix jobs are fine. £20 quid all in.