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- 13 Apr 2016
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need some materials advice for a specific problem. need to put a shelf across a 700mm span , 600mm deep alcove, to support 120kg uniform load. solid internal house breeze block wall on 2 sides and back
sound trivial, ... but, there is an immovable object below the shelf that means I cannot drill for fixing any lower than the height that the shelf actually needs to go at, and I need a way to mount the fixings to the wall , and the spans to the fixings, with minimal access from underneath.
furthermore, I cannot go up by much in terms of the height of the supports for the shelf / the shelf itself , between the immovable object below, and the height I need the shelf's level to be at.. I've only got about 60mm of height to play with between the below object and the shelf finished height. the fixings can go higher.
I was thinking of using these something like these angle brackets (facing outwards and upwards so they can be fixed from above) to get onto the wall and then smallest timber I can get away with to span the width, screwed to the brackets before the brackets are screwed to the wall (can't do after... can't get from underneath). however I'm struggling to find a load rating vs span for smaller size timber e.g. 38x38 rather than the larger ones used for joists, studwork etc - any pointers please? there's space to put in multiple fixings and spans, 3 or 4 or 5 is fine... doesn't have to be just 2. then just say 12mm ply for the shelf (appearance is unimportant).
have also considered possibly using the metal support beams that used as spans in much industrial shelving but not clear how such would be wall-fixed in this situation or where to source as a standalone item that'd need to be cut to size / not spend a fortune.
thanks in advance
sound trivial, ... but, there is an immovable object below the shelf that means I cannot drill for fixing any lower than the height that the shelf actually needs to go at, and I need a way to mount the fixings to the wall , and the spans to the fixings, with minimal access from underneath.
furthermore, I cannot go up by much in terms of the height of the supports for the shelf / the shelf itself , between the immovable object below, and the height I need the shelf's level to be at.. I've only got about 60mm of height to play with between the below object and the shelf finished height. the fixings can go higher.
I was thinking of using these something like these angle brackets (facing outwards and upwards so they can be fixed from above) to get onto the wall and then smallest timber I can get away with to span the width, screwed to the brackets before the brackets are screwed to the wall (can't do after... can't get from underneath). however I'm struggling to find a load rating vs span for smaller size timber e.g. 38x38 rather than the larger ones used for joists, studwork etc - any pointers please? there's space to put in multiple fixings and spans, 3 or 4 or 5 is fine... doesn't have to be just 2. then just say 12mm ply for the shelf (appearance is unimportant).
have also considered possibly using the metal support beams that used as spans in much industrial shelving but not clear how such would be wall-fixed in this situation or where to source as a standalone item that'd need to be cut to size / not spend a fortune.
thanks in advance