Hello,
I have a question regarding my terrace roof (KD roof, 8m (26 feet) by 4m (13 feet), 10mm (0.4 inches) laminated safety glass, 3 posts). I measured the cross beams (each 4m (13 feet) long) and noticed a sag of about 5-6mm (0.2 inches) in the center at the front. Is this still acceptable, or should I report it to KD? Could it bend further? After rain, there is always some water standing in the middle of both beams, about 1cm (0.4 inches) deep. The roof has been installed for 2 weeks.
Does anyone have experience with this? Thank you.
I have a question regarding my terrace roof (KD roof, 8m (26 feet) by 4m (13 feet), 10mm (0.4 inches) laminated safety glass, 3 posts). I measured the cross beams (each 4m (13 feet) long) and noticed a sag of about 5-6mm (0.2 inches) in the center at the front. Is this still acceptable, or should I report it to KD? Could it bend further? After rain, there is always some water standing in the middle of both beams, about 1cm (0.4 inches) deep. The roof has been installed for 2 weeks.
Does anyone have experience with this? Thank you.
gutentag schrieb:
Water certainly must not remain standing there.But if there is a raised area in the middle, where the two beams meet at the joint edge, water will inevitably collect there.
Hello,
I don’t fully understand this statement here:
but in case you’re asking if your beams spanning 4 m (13 feet) are allowed to deflect 5-6 mm (0.2 inches) in the middle:
Yes, they are. Steel construction is normally designed with a deflection limit of L/200, meaning under load the beams may deflect length/200 = in this case 20 mm (0.8 inches).
If you want less deflection, the required cross section (and thus the cost) of the beams will increase significantly.
Water should not actually accumulate at any joints. That causes ongoing decay and problems.
Best regards,
Andreas
I don’t fully understand this statement here:
volik83 schrieb:
that the cross beams (each 4 m (13 feet)) have a deflection of 5-6 mm (0.2 inches) towards the center now
but in case you’re asking if your beams spanning 4 m (13 feet) are allowed to deflect 5-6 mm (0.2 inches) in the middle:
Yes, they are. Steel construction is normally designed with a deflection limit of L/200, meaning under load the beams may deflect length/200 = in this case 20 mm (0.8 inches).
If you want less deflection, the required cross section (and thus the cost) of the beams will increase significantly.
Water should not actually accumulate at any joints. That causes ongoing decay and problems.
Best regards,
Andreas