Extending joists and hanging on wall plate

[xaerocool49]

Hi all,

I tried to search through various threads but couldn't find an answer that answered my question, various posts about hanging joists and wall plates but none answered my question.
Changing the construction of the internal house and making a bathroom and bedroom a bigger means having to extend the existing floor joists by 150mm each.

The span of the joists is currently 2.4m and the joists in place are 2 x 7 (47 x 175cm).

The joists are 430cm spacing

The bathroom is only 5 joists wide 200cm and the bedroom is 8 joist wide 360cm. Both are the 2.4m span above.

The builder has attached a 2 x 7" (47 x 175cm) timber wall plate to a solid single skin brick wall. He's then drilled holes and used resin anchors and M12 bolts to secure the wall plate at 400mm staggered spacing.

He's then added a 1m timber to sister each joist and extend it to the face of the wall plate. He's secured each of the extensions to the side fo the existing joists with 75cm screws and each has 3 M12 bolts going through them.

The above all seems fine and secure.

The bit i'm not sure about is the hanging, he's used joist hangers with nails to secure each joist to the wall plate.

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He's nailed each of the holes to the face of the wall plate and the top but he hasn't done the back because you can't wrap the hanger around to the top of the joist as the wall is the way.

The room will be used for residential use, the bathroom for the bathroom

Should he have used different hangers or are these fine?

Initially he told me he had to buy this other type but then he said he found these in his van and now i'm not sure if he's short cutting or if i'm being paranoid.

Just don't want the floor/ceiling coming down, got baby brain which is not helping either

Many thanks

J.

 

[DAZB]

If he has fully face nailed the hangers and also nailed the top of the wallplate then you will have nothing to be worried about as he has given it plenty of overlap and adequate number of fixings too but you could ask him to skew nail or even screw some more fixings diagonally through the extended pieces into the wallplate as it wouldn't take him long to do. He does appear to be doing a decent job of it compared to some we hear about.

 

[xaerocool49]

@DAZB Thanks for the swift response

I think the extended screws would have needed to be done before the joist hangers as they are covering the ends of the extended pieces now but I'll ask him.

Does it matter the far end of the joist is also on hangers? but those are hangers that are going into the brick work...I'm guessing not but if you could confirm that would be great thanks.

Phew...i didn't sleep last night thinking about this, I guess the silver lining was i didn't need to get up for feeding time....

 

[DAZB]

There will be enough room for the screws to fix through even with joist hangers, it may just need a longer screw and perfectly fine with the other end being on hangers too. As the joists can't physically move in any direction, and are fixed into the hangers and through from the floor above everything will be solid. You have done well to find someone who isn't cutting corners, especially in London from what I hear in general.

 

[blup]

Does it matter the far end of the joist is also on hangers? but those are hangers that are going into the brick work.

Provided there is sufficient masonry above, is he letting the hangars into the brick?

 

[Notch7]

He's nailed each of the holes to the face of the wall plate and the top but he hasn't done the back because you can't wrap the hanger around to the top of the joist as the wall is the way.

I can’t see any issue with that at all

Jiffy type hangers go up and across the top not down the other side.

Has he used 3.75mm 30mm twist nails for the hangers - he should use the correct ones.

It’s more than strong enough for the load.


Using a bolted wall plate is a very strong method of fixing

And his joist extensions with 3 x bolts and screws is strong


All sounds fine to me

 

[xaerocool49]

@blup Thanks for coming back to me, there are 3 course of brick above the top of the wall plate, (4 or 5 from each bolt due to the staggerring) and there is then a 3 x 4 inch timber across the top of the bricks. Is gravity and force not going downward? Sorry if that's a silly question.

There were the same number of courses as when the unextended joist were attached to the wall.

@Notch7 Yes he has used 3.75mm x 30mm twist nails and filled every hole, on the face, bottom and top.

He also added the 100mm screws through the side of the joist as Dazb suggested.