RSJ Supporting Floor Joists Question
Posted 18 October 2006 - 09:23 AM
Builder has just installed the first of 4 required RSJ's, this one supports the new first floor joists.
Floor joists run along length from front to back (7.6M)therefore the RSJ splits this span in two. Floor joists are notched and inserted into each side of the RSJ so that it is not visible at ceiling level (Joists: approx 225mm x 45mm, RSJ: approx 200mm x 140mm)
My question is about the installation of the RSJ, as there are cavity walls each side of the garage (100mm wide block with a 100mm cavity - one is the two story side of the house and the other is the gable end of the garage with a total width between them of 3.25M)the builder cut a square hole through one skin of the cavity either side of where the rsj was to sit, then cut the rsj to the width of the floor plus 100 mm either side, because of the 100mm depth of the cavity he was able to fully insert the rsj 200mm on one side and then move it back so it was resting 100mm on both sides, he then simply packed under the rsj so it was at the right height before installing the floor joists.
Is this method acceptable or will it cause problems over time because no padstones were used?
the RSJ is only supporting the floor and nothing else.
Posted 18 October 2006 - 12:56 PM
Posted 19 October 2006 - 07:14 AM
If crushing strength of brick = 1N/mm2 then load that one end of RSJ can take is 140 x 100 = 14000N which is 1.4 tons. Since there are 2 ends to RSJ total load that RSJ can take is 2.8 tons. Assuming bricks have have a crushing strength of at least 3N/mm2 RSJ allowed to take 3 x 2.8 = 8.4 tons. Can you get 5 cars in your bedroom???
Posted 19 October 2006 - 10:13 AM
Saddened1: the packing appears to be pieces of some sort of cement particle board about 5 or 6mm thick (not sure of the name)probably salvaged from the edge of the original roof (used underneath edge roof tiles to hold cement in place) total height of packing is approx 25mm.
Derekfarr: Thanks for the calculations! the 1st floor room is to be an upstairs Lounge/Games room with a second floor mezzanine at attic level overlooking it, so the heaviest thing I can foresee in it is a Pool Table!
Posted 25 February 2010 - 05:48 PM
Posted 25 February 2010 - 11:44 PM
Can you get a drill bit long enough to go through both beams and the wood in one go? If so I'd clamp it all up and do it that way.