Thedreamer Posted March 11, 2020 Share Posted March 11, 2020 Our hot water tank (in the downstairs utility) is probably going to weight about 350kg. This will sit on 18mm plywood, a thick anti vibration mat, then 22mm chipboard T&G and finally 45 x 145mm joists at 400 centres. The span of the joists is quite reasonable at 2 meters and the tank is well placed next to wall. Is it irrational to be worried out this weight? If it ever became an issue would I notice a sag rather than the joists snapping Link to comment Share on other sites More sharing options...
Mike Posted March 11, 2020 Share Posted March 11, 2020 (edited) That's a good sized tank, but the timber size sounds normal for that span, even if the load is more than normal (1.5kN/m²); personally I wouldn't be worried. And yes, the joists would flex if there were to be a problem - so without a ceiling beneath not such a big issue. Edited March 11, 2020 by Mike 1 Link to comment Share on other sites More sharing options...
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