joists

[allanandr]

i have to bolt together 175x50 joists using 12mm bolts can any body tell me the spacing and stagger measurments, also would 30mm clout nails be ok for jiffy hangers.

 

[noseall]

i have to bolt together 175x50 joists using 12mm bolts can any body tell me the spacing and stagger measurments, also would 30mm clout nails be ok for jiffy hangers.

Typically you would say, bolt them at 600mm centres, with dog tooth washers or spurs staggering high and low along the beam. This does not account for all scenarios. Some spec's i have seen recommend 750mm others 450mm. What does the s.e. say?

30mm clouts will be ok for jiffy hangers.

 

[wflworks]

12mm bolts sound fine to me. Washers on the outside and a dog washer between the two timbers.

Stagger the bolt positions along the length of the beam. 1200mm centers should be adequate.

Position the two end bolts between 300mm and 450mm in from the end of the beams.

30mm clout nails will be fine for lightweight jiffy hangers. If you are not too sure then screw them into position.

 

[noseall]

1200mm centers should be adequate.

1200mm centres? If the beam is only say 3.6m long that is a total of three bolts. Seems a bit lean to me.

 

[freddiemercurystwin]

http://www.nhbcbuilder.co.uk/NHBCpublications/LiteratureLibrary/Technical/filedownload,21418,en.pdf see page 5, in the absence of anything detailed on your drawings run this by building control to make sure he's happy before you bolt them together. Use M12 galv studding (or bolts if you can't be bothered to saw them) with plate washers ( http://www.topfix.co.uk/images/products/miscell_platewashers.jpg ) and personally I'd use lock washers too.

 

[allanandr]

hi thanks for that i was sure that they would have to be staggered.