Hi all, I wondered if you fine folk could help me with some advice on this one. I have built a small garden room at the bottom of the garden under permitted development. Block built structure with 100mm cavity wall 5m by 3m. I was just curious if I could use a concrete lintel (one for each - inner & outer leaf) instead of the normal catnic? I have only ever used catnic in the past so have never used concrete on a span as wide as 2500. It is to go above french patio doors and will be holding a standard flat roof above so nothing too heavy but was unsure on using concrete for a span that long. I could just go with catnic but that will push the whole 2.5m high rule very close and may even exceed by the time the rafters and roof are on. Its an awkward one because I will be way within the 2.5m height rule at one end but the other end is touch and go because the garden slopes away, which is why I was curious about using concrete lintels to save on height. As always guys any advice is much appreciated.
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Concrete Lintel
- Thread starter smash_it
- Start date
65mm lintel 2500/2800 long, which company makes those?
65x100 is the standard but you can get deeper ones to suit the loads which will be more effective as 2x65 won't give you the equivalent of 130
What detail are you having over the doors: the roof will sit on the inner leaf. Do you need an outer skin lintel?
What detail are you having over the doors: the roof will sit on the inner leaf. Do you need an outer skin lintel?
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Just a heads up a 65 lintel spanning 2.5m the allowable Service Load is about 0.8kn/m and based on a 1.5m width of roof loading at a nominal 1.25kn/m2 (snow load +dead load) would give a loading of 1.2kn/m so one in theory would not be enough so as Woody says they need to be doubled up so they are taking half the load each but as Stevie88 says its more efficient to get a depth of lintel to suit the actual load, a 100mm one being the equiv of 2 x 65mm
Based on the calculated 1.2kn/m and an unfactored load spec of 2.82Kn/m for the lintel it is well within acceptable design parameters
93 kg's - WT actual F!
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