"rog" wrote in message
...
On 4 June, 21:17, Tim Watts wrote:
On 04/06/10 21:15, Davao - Arthur55 wrote:





wrote in message
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Hi I'm putting a new floor level in an old concrete block building. I
am intending to hilti bolt a 3 x 6 wooden beam on opposing walls then
using joist hangers on them joisting across ( 14ft 1in span, 18inch
spacing ) with 6x2 joists.
Any suggestions on dimensions and spacing of the hilti bolts, also am
going to double up joists where bath& water cylinder etc will be; is
it normal to have double width hangers for this or just bolt together
timbers?
I'm stuck with max 6in depth of joists as stuck for internal room
height.

None of the above advisors answered your question on the hilti bolts.
I'd be interested in the answer to this particular qustion.

Good luck.

Arthur

One did - he said 200mm in from the and every 450mm (or joist spacing).
I think he also said "use resin bolts" which is what I would do too,
especially for something like this.


That was me ....

in case it wasn't clear the end bolts 200mm in ... not too close to end to
avoid splitting, and then one between each joist span.

Resin studs will put a lot less strain on 'unknown' quality old blockwork.
You could find expanding sleeeve anchors shatter the blocks ... or spall off
big chunks.
Resin will give a very strong fixing and no risk of damage to the blocks.

I recently put in 64 16mm diam anchors this way into a reinforced raft,
resin fix is a very good solution.

(Screwfix sell it .. easy enough to get hold of)