Prop the ceiling directly underneath the ceiling joist/hanger intersection on either side of the skylight opening (make sure you get the props directly under a ceiling joist). They'll be easier to get in the roof being shorter, and they'll also be cheaper than getting a 240X45 F17 at 6 metres since a 5.4 won't be long enough. What I'd do is get two 140X45 F17 hangers at 3 metres across the 2.8m span. I assume that a 190x38 beam is large enough for the 5400mm span with joists at 1400mm - can anyone advise? I've got a fairly limited table for hanging beams that only goes up to 4200mm spans. I've found some span tables that indicate that maximum span for 100x38 F14 joists is 2400mm, but how do I know what grade timber my joists are?ģ. Does moving the hanging beam as per the above sound feasible / advisable?Ģ. Ideally, I would like to move the hanging beam by about 600mm so the joist spans would be 2000/800mm instead of the current 1400/1400.ġ. Unfortunately, as the hanging beam runs right down the middle of the room, it seriously limits my options for placement of a skylight. Mid-way along these joists there is a 190x38mm hardwood hanging beam spanning the 5400mm from external wall to internal load bearing wall. Above my kitchen (5400 x 2800mm) I have 100x38 hardwood ceiling joists 450mm centres spanning the 2800mm from external wall to internal load bearing wall. I have a circa 1970 fibro clad cottage in the southern suburbs of Sydney with hardwood timber framing, a conventional roof structure and concrete tiled roof. Hi, a question about my roof timbers please guys.
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