Palram SUNTU Plus - Manual (Page 8)

6
Greenhouse Installation Guide
Arching Radius
When covering curved structures, it is possible to set the sheets on an arched framework
so that they will arch within the range of elasticity of the sheets without inducing stress.
The minimum radius of the arch created is 3.00 m for Omega and 4.00 m for Greca.
Screws, Washers and Gaskets
1. General Recommendations: For optimal long-term maintenance
free service, Palram strongly recommends the use of heavy-
duty corrosion resistant screws, and special metal washers with
profiled 4 mm (at least) thick EPDM rubber gaskets*, 19 mm
(crest) or 25 mm (valley) diameter (in Greca profile both crest
and valley with 19 mm), to fasten the sheets to the supporting
structure and seal the fastener’s hole (Figure 1).
2. Use of self-tapping screws with pre-drilled holes or self-drilling
screws is recommended. For wooden purlins, a special wood-
screw should be used (Figure 2).
3. The screw placed into corrugation crest should be 6.3 x 38 mm
(1/4 x 1 1/2 in.) or a #12 or 14 gage screw. Screws placed in a
corrugation valley should be 6.3 x 25 mm (1/4 x 1 in.). Each
screw should be fitted with a conical corrosion resistant metal
washer at least 1 mm (0.04 in.) thick and a special EPDM gasket.
The screw should be tightened moderately without deforming
the washer and rubber gasket or distorting the corrugation.
4. Special attention should be given to the insertion of the screws
perpendicular to the material face. Oblique insertion could
damage the sheet and/or result in leaks (Figure 2).
* Palram offers to supply, upon demand, the recommended fastener combinations
mentioned above, along with the SUNTUF Plus sheets.
Roof and Wall Fastener Location
1. A fastening screw should be inserted into at least every third corrugation valley at each internal purlin.
2. Along the edge purlin, the screws are to be inserted into alternate corrugation valleys.
3. Along the length overlap, the screws are to be inserted into the overlapping corrugation crest on top of each purlin.
4. A hole must be pre-drilled into each screw location. The diameter of the hole must be 4 mm larger than that of the screw.
5. The screws should be tightened with an electric screwdriver with an adjustable clutch, taking care not to over-tighten.
Excessive tightening may harm the sheet and cause premature failure.
6. Sheet-to-sheet stitching fasteners are recommended along the length of overlapping corrugations between the purlins,
at least 2 units at every span (See “Sheet-to-sheet stitching fasteners”, Page 7).
90°
Lay Sheets against
Wind Di
rection
Direction of
Wind and
Rain
Int
ernal
Pu
rlin
to
Pu
rlin Distance
Edge
Pu
rlin
to
Pu
rlin Distance
100 mm
M
inimum Slope 10%
Width Overlap
Length Overlap
120-200 mm
19 mm washer
19 mm washer
19 mm washer
Greca Profile
Omega Profile
25 mm washer
25mm washer/gasket 19mm washer/gasket
INCORRECT -
Non-perpendicular drilling
and insertion.
CORRECT INCORRECT -
Excess over tightening
Self-tapping screw Self-drilling screw Wood screw
90°
Lay Sheets against
Wind Di
rection
Direction of
Wind and
Rain
Int
ernal
Pu
rlin
to
Pu
rlin Distance
Edge
Pu
rlin
to
Pu
rlin Distance
100 mm
M
inimum Slope 10%
Width Overlap
Length Overlap
120-200 mm
19 mm washer
19 mm washer
19 mm washer
Greca Profile
Omega Profile
25 mm washer
25mm washer/gasket 19mm washer/gasket
INCORRECT -
Non-perpendicular drilling
and insertion.
CORRECT INCORRECT -
Excess over tightening
Self-tapping screw Self-drilling screw Wood screw
Figure 1
Figure 2
Figure 3
90°
Lay Sheets against
Wind Di
rection
Direction of
Wind and
Rain
Int
ernal
Pu
rlin
to
Pu
rlin Distance
Edge
Pu
rlin
to
Pu
rlin Distance
100 mm
M
inimum Slope 10%
Width Overlap
Length Overlap
120-200 mm
19 mm washer
19 mm washer
19 mm washer
Greca Profile
Omega Profile
25 mm washer
25mm washer/gasket 19mm washer/gasket
INCORRECT -
Non-perpendicular drilling
and insertion.
CORRECT INCORRECT -
Excess over tightening
Self-tapping screw Self-drilling screw Wood screw
90°
Lay Sheets against
Wind Di
rection
Direction of
Wind and
Rain
Int
ernal
Pu
rlin
to
Pu
rlin Distance
Edge
Pu
rlin
to
Pu
rlin Distance
100 mm
M
inimum Slope 10%
Width Overlap
Length Overlap
120-200 mm
19 mm washer
19 mm washer
19 mm washer
Greca Profile
Omega Profile
25 mm washer
25mm washer/gasket 19mm washer/gasket
INCORRECT -
Non-perpendicular drilling
and insertion.
CORRECT INCORRECT -
Excess over tightening
Self-tapping screw Self-drilling screw Wood screw
Positions for fastening roof or wall screws at internal purlin.
Positions for fastening roof or wall screws at edge purlin.
Gr-76 1870
Gr-76 1870
Gr-76 1870
Gr-76 1870