Palram SUNLIT - Manual (Page 8)

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2. Two-Sided Clamped Glazing
This is a simpler glazing system to install, requiring no mid-sheet
fastening, using long glazing sheets, and held in place by two
glazing profiles on both longitudinal edges. It is not as strong, and
permitted width is limited (the width direction of a multi-wall sheet
is more vulnerable to loads, span-wise, especially the thinner, square
ribbed 6 , 8 and 10 mm sheets).
Maximum Width of SUNLITE Sheets in Two Sides Clamped Flat Glazing
Twin Wall Triple Wall X-Lite
Uniform Load 6 8 10 8 10 16 16 25 32 35
Kg/m² psf mm Inch mm Inch mm Inch mm Inch mm Inch mm Inch mm Inch mm Inch mm Inch mm Inch
50 10 450 18 540 21 680 27 575 19 700 25 990 39 1100 44 1250 50 1200 48 1200 48
80 16 320 13 430 17 500 20 450 15 525 18 900 36 1050 41 1100 43 1000 38 950 38
100 20 - - 400 16 450 18 400 14 475 17 800 32 1000 35 1050 41 950 37 875 35
120 25 - - - - 400 16 - - 425 14 700 28 975 38 1000 40 900 36 800 32
Note: The notes attached to the previous table, Maximum Recommended Distances, also apply here.
3. Two-Sided Clamped Arched Glazing
1. SUNLITE sheets can be curved into arches within the permitted radius
(see “Arching Radius” on page 3) without damaging their mechanical
performance. Moreover, internal stresses induced by curving give the
sheets extra strength and rigidity in both directions, like pre-stressed
concrete elements.
2. Rigidity and support spans increase as the curve radius is reduced (down
to the minimal permitted radius). Shallow curving should be considered
to be similar to flat panels, while a deep curve significantly adds to the
bridging ability.
The table in the next page shows the growing rigidity from the curving of SUNLITE, at various uniform loads.
SUNLITE glazing
Side clamp
(Glazing profile)
Supporting rafter
Figure 4
Flat, two-sided clamped glazing
SUNLITE glazing
Clamping/glazing profile
Supporting
arch
Figure 5