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Old 09-17-2013, 06:29 AM   #16
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Strengthening Ceiling Joists


Hi Mike,

Thanks for the reply, the truss joists go from party wall to exterior wall and seem to sit on top of the brickwork, so I'm not sure how that holds the walls out but I'm not an engineer so I could well be talking rubbish. I appreciate all the feedback from you guys and hopefully I can have a solution too.

I'm wondering whether I can strengthen the existing joists with joust hangers to the truss and gable ends and then nail batons on top to give the extra height. Either that or run new joists but if possible I prefer the first option

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Old 09-17-2013, 07:12 AM   #17
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Strengthening Ceiling Joists


Your plan will work---the one glitch will be finding Joist hangers that fit the new lumber and the old,full dimension lumber----You may need to get creative.

Structurally speaking----the roof rafters need that beam to keep the triangle shape --if it were not there the roof rafters would push out the wall when under snow load--or simply slide off of the top of the wall and collapse.
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Old 09-17-2013, 08:22 AM   #18
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Should I be concerned about this cracking / splitting in the truss?
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Old 09-17-2013, 08:29 AM   #19
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Strengthening Ceiling Joists


Will these brackets be ok for use on the trusses do you think?
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Old 09-17-2013, 08:34 AM   #20
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Strengthening Ceiling Joists


However at the gable end I'm not sure what to use as I don't think the above would work as I don't have the height on the timber.
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Old 09-17-2013, 08:58 AM   #21
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Strengthening Ceiling Joists


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Originally Posted by liam546 View Post
I own a Victorian property which has 4x2 ceiling joists.
I want to strengthen these joists as well as increase the height of them.
Why? Do you have any objective reason to think this work is needed?
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Old 09-17-2013, 09:30 AM   #22
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Strengthening Ceiling Joists


Two reasons is behind my thinking

1: I want to heighten the joists so that I can increase insulation between joists but so I can also tack electrical wiring safely away from the insulation. Of tack it right at the top of the joist a few cms away from the insulation.

2: I want to lay loft flooring up there to support bits for storage.
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Old 09-17-2013, 10:07 AM   #23
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Strengthening Ceiling Joists


You have some nice chunks of wood there.

For putting insulation up there, I would think that you have the best situation right now. If you are using batts, I would put one layer to the height of the existing joists and another layer at right angles overtop.
I did not realize there was a safety issue with fiberglass insulation touching wiring.

However, if I ever needed to walk up there, I would feel a lot more comfortable knowing there were hangers under those joists.
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Old 09-17-2013, 02:58 PM   #24
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That style of construction tells me the house may be older than Victorian---
Either that, or alternatively could it be somewhere other than the US?
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Old 09-17-2013, 03:02 PM   #25
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Strengthening Ceiling Joists


knob & tube wiring is the only wiring I know that requires air circulation that creates issues with insulation being against the wiring
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Old 09-17-2013, 05:52 PM   #26
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Those 'cracks' are not a concern--they are called 'heart checks' and do little to weaken the timber----

If you sister in larger joists ,you will need a double hanger---large enough to hold the new and the old joists---
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Old 09-18-2013, 03:45 AM   #27
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Either that, or alternatively could it be somewhere other than the US?
He's in the UK. Also--don't know if it affects anything--that is a slate roof so there's a bit of weight on that truss now.

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