Joist & Hanger Recommendations for Garage

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Hi Guys,

I have a 6m x 3m single garage which I want to board out. I don't think the roof structure is very strong so wanted to add two joists across at 2/3 intervals to the width to add strength for any weight I want to put up there.

Can anyone suggest wall joist hangers and timber size recommendation?
 

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L

Leofric

I have just done that with my single garage with roof pitched front to back. I used 2no approx. 170mm by 45mm timber beams on joist hangers nailed to same size timbers fixed with throughbolts to block piers on one side and across to block (partition with adjoining garage ) wall other side . Then approx. 70 x 38mm joists between truss ties.
Timber connectors fixing joists to beams. Problem I had was throughbolts not tightening in blockwork and pulling out as nut tightened.
 
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I have just done that with my single garage with roof pitched front to back. I used 2no approx. 170mm by 45mm timber beams on joist hangers nailed to same size timbers fixed with throughbolts to block piers on one side and across to block (partition with adjoining garage ) wall other side . Then approx. 70 x 38mm joists between truss ties.
Timber connectors fixing joists to beams. Problem I had was throughbolts not tightening in blockwork and pulling out as nut tightened.
Great minds think alike!! No idea what you are talking about though with block piers and truss ties.. Googling..
 
L

Leofric

Will try and post some photos. Truss ties or ceiling joists are the bottom horizontal timbers of the trusses. I actually used 3 timber beams going across the central third of the garage, i.e with 2 of those beams below the gang nailed plates where the truss timbers join the bottom ties/ceiling joists.
You can get all the joist hangers , timber connectors, screws, expanding bolts etc from Toolstation .The piers shown on your garage photo are brickwork, mine are brick gable wall with blockwork internal piers. You might consider chemical fixings for the loadbearing fixings into the brickwork.
 
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I've spent hours looking into this. Why did you use vertical joists and nail the joist hanger to them? Can't you just bolt the joist hanger into the wall? If you can send me a photo I'd be so grateful. :)
 
L

Leofric

I didn't use vertical joists. I used horizontal 440mm lengths of offcuts from the 170 by 45 timber beams and bolted them to the walls as bearers and then screwed the joist hangers to the face of these bearers. The beams across the garage then sit in these metal hangers under the original bottom members of the trusses. I will try and post some photos ,if I can figure out how to do it, and you will see it is quite simple really. Screwing the hangers to timber bearers is a bit easier for levelling up the beams I think.
 
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Leofric

'Another option might be to sister the existing beams with glue/screws. ' This the easiest way to strengthen the joists but they are still hanging from the gang nail plate connections which I saw as a weak point, also the 18mm chipboard is spanning 600mm across the trusses. Putting beams across takes load of the truss connections and adding joists between trusses means chipboard is supported better. Depends how much you intend storing up there but roof trusses aren't designed to take a lot of extra loading without some additional support.
 
L

Leofric

brooky - you don't need the smaller light coloured timbers under the main bearers for the joist hangers as I show in the photos , (I just used fixed these with plastic plugs and screws as temporary support while doing things single handed) but when I found the expanding bolts were tending to pull out when tightened I put bolts with adhesive through them and left them as permanent support .
 
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The biggest issue I'm having now is sourcing the right joist/hanger combination. You'd think that's be the easy bit!

I want ones to bolt into masonry with M12 bolts.
 
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