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09/05/2025 11:15 am
Hello,
There is a paragraph in clause 5.4.1 of the wind code “Under-eaves pressure shall be taken as equal to those applied to the adjacent wall surface below the surface under consideration”
My question is, should this be added to the pressure acting on the top of the roof (the “over-eave”)?
I’ve got a fairly typical warehouse with a low-pitch roof, which extends out 2m over the wall where the roller doors are. I’m using +0.7 as the under-eaves shape factor (Table 5.2a) and -0.9 as the over-eaves shape factor (Table 5.3a) for a net shape of 1.6 upwards.
I’m comparing it to the canopy shape factors (Table B9) which have a max of 1.5 upwards, and wondering if I’m being too conservative?
09/05/2025 12:51 pm
I would normally use the approach you have suggested for wind direction across the eaves(i.e. wind towards the wall), with a net uplift of -1.6, but note you can use combination factors for pressure acting on two effective surfaces.
My take on the attached canopy factors is that you usually have some wall above the canopy level, hence the hc and h parameters, so it is not really the same situation as an eave that is an extension of the roof line.
It may be appropriate to use the canopy values for wind along the eaves.
17/06/2025 11:50 am
Thanks Josiah.
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