Panel End Lap |
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When a lap is required the ends of the
panel are notched and pre-punched in the
factory to ensure the best possible basis
for the site formed joint. The 100mm
overlap is used to ensure maximum joint
integrity when used on low roof pitches.
The underlapping panel incorporates a
steel plate under the surface of the outer
skin to enable the joint to be formed
without the fasteners fully penetrating the
panel. The overlapping panel is prepunched
to allow precise location of the
fasteners through the sealant close to the
panel edge.
Fixing to Support Steelwork
The panels are secured to the support
steelwork by means of self-drilling, selftapping
screws.
Depending upon the anticipated design
wind loading to be applied to the panels,
either one or two fixings may be required
to each side of the panel at every purlin.
The application of two fixings is not
considered practical when the flange of the
support purlin is less than 50mm wide. |
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Panel Side Joint |
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The panel side joint features a compressible
seal full height of the panel edge. The
through fixing screws secure the panel to
the support purlin and are in turn concealed
by the snap cap. Where specified, the
joint can be site sealed at the inner skin
of the panel using a butyl sealant. This
type of seal is normally used in conditions
of high humidity. Panel module and good
joint compression are essential; fixing
clamps DRT1 should be used during the
site assembly.
End Lap - Fixing & Sealing
Site conditions and tolerances will occur
due to site conditions however the
following minimum criteria must be
achieved to ensure correct functioning of
the joint.* Minimum fastener edge distance
40mm edge distance is required to
ensure the panels strength as fitted will
comply with CDM fragility requirements.
** Panel bearing distance
A nominal distance of 20mm is shown,
this site dimension can vary however to
comply with CDM fragility requirements it
must not be less than 10mm.
*** End seal position
A nominal distance of 10mm is shown,
any site measurements above 20mm will
invalidate Corus Confidex Guarantee.
The details show the end lap joint
dimensioning for a cold formed section of
60mm minimum flange positioned
correctly on the rafter. On large or
complex roofs, practical site conditions
may be such that the above dimension
cannot be achieved. It is recommended
therefore where roofs incorporate
multiple end laps, purlin extension plates
be used.
When fitting the panel end lap the intent
is to ensure a seal along the entire panel
width. Correct sealant application,
cleanliness correct alignment and use of
tools is of particular importance to ensure
a functioning joint. |
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Snap Cap End Lap
Each snap cap incorporates a crimped and
cut end to enable a 75mm overlapping
joint to be formed. The cap is supplied
complete with a factory supplied foam
seal. The snap caps are supplied in precut
lengths to suit the measurement of
the roof slope. They are available up to a
maximum of 8.075 metres inclusive of
the 75mm crimp end.
It is recommended when fitting that the
overlap joint in the snap cap avoids any
end lap in the insulated panel by at least
300mm. To avoid movement, the cap
must be fixed to the panel at the ridge
eaves and either side of the cap end lap.
Snap Cap Quantities
This typical example shows a panel slope
length of 21 metres. In this situation 3
snap cap lengths are required. Typical
quantities to make up the panel length
would therefore be:
2 at 8075mm (ref SCR 8075N)
1 at 5000mm (ref SCR 5000P) |
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Snap Cap
Type |
With
Lap |
Butt
Ended |
| Roof DR1000 |
SCR__N |
SCR__P |
|
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| Example: A roof snap cap with an overall length of
8075mm with a lap is referenced SCR8075N. |
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|
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- Fixings - See page 4:49 for fixing reference and manufacturer contacts.
See Section 13 for fastener technical requirements.
- Sealants - See Section 13 for sealant information & technical requirements.
|
|
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Panel End Lap |
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Each Ward panel is supplied cut to the
specified length and incorporates the
eaves and panel overlap details. Six basic
panel types are available to cater for the
detail variations which may occur in a
typical building.
The downslope end of a panel will
require an eaves cut back or panel end
lap. The cut back is normally 100mm, in
the case of a valley of boundary wall
gutter and 65mm in the case of a
streamline eaves external gutter. When
the panel end lap is required, a cut back
of 100mm is provided and the outer skin
of the profile includes the pre-punched
holes for the screw fixings.
The upslope end of the panel may require
a lap plate and/or a joggled outer profile. A
joggled outer sheet profile is only required
when used with interlay roof lights. A lap
plate is incorporated within the panel to
accept the fixing screws. The lap plate is
not required when its presence will hinder
the passage of through fixings.
The pre-engineered panel options are
noted in the table. |
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| Panel type |
Cut back (mm) |
Lap plate |
No lap plate |
Joggled* |
| End lap - Punched |
100 |
HL100 |
HX100 |
HJ100 |
| Valley - Not punched |
100 |
PL100 |
PX100 |
PJ100 |
| Eaves - Not punched |
65 |
PL65 |
PX65 |
PJ65 |
|
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Note: HJ100 and PJ100, PJ65 include a lap plate *Note: The minimum length of joggled sheets is 3.0m
Applications
The tables below show the panel options
required for different roof cladding
arrangements which may occur on a
typical building.
Each configuration first notes the
condition at the downslope end of each
panel, such as eaves or overlap end cut
back, and then notes the condition at the
upslope end of the panel.
The diagrams alongside show the panels
used in these applications. |
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| Table 1: Full length panels |
| Panel configuration |
Panel type |
| Eaves to apex |
PX100* |
| Eaves to lap |
PL100* |
| Lap to lap |
HL100 |
| Lap to apex |
HX100 |
*PX65, PL65 panels are available should a 65mm
cut back be required. |
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| Table 2: Dome rooflight applications |
| Panel configuration |
Panel type |
| Eaves to rooflight |
PX100 / 65 |
| Lap to rooflight |
HX100 |
|
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Table 3:
Interlay GRP rooflight applications |
| Panel configuration |
Panel type |
| Eaves to rooflight |
PJ100 / 65 |
| Lap to rooflight |
HJ100 |
| Rooflight to apex |
HX100 |
| Rooflight to lap |
HL100 |
|
| |
| Table 4: Roof aperture applications |
| Panel configuration |
Panel type |
| Eaves to aperture |
PL100 / 65 |
| Lap to aperture |
HL100 |
| GRP rooflight
to aperture |
HL100 |
| Aperture to apex |
HX100 |
| Aperture to panel lap |
HL100 |
| Aperture to
GRP rooflight |
HJ100 |
| Aperture to
dome rooflight |
HX100 |
| Aperture to aperture |
HL100 |
|
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Standard Ridge
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