Redpath Tunnelhouse Mk2 Manual page 5

Step 4
: If you have a roof vent option install the roof vent base part now,
See Image V1 below.
NOTE: The roof vent may be positioned in any of the Tunnelhouse 1.5m sections; however, you cannot fit a roof vent in a section directly
beside another section that might already have a roof vent. The two hoops that will have the roof vent fitted in-between them should have their
flat aluminium side faces, - facing toward each other.
When you have decided which section to place the roof vent in, double-check that the hoops are 1.5m at the apex apart then ....
1. Use two 22mm screws at the end of each vent rail to secure the rails to the top face of the central hoops (8 screws in total)
V1
If you have a roof vent option, Fit the roof vent steel base rails now – Use 2 x 25mm screws at each end (8 in total)
Step 5a:
Join the 4 roof purlins –
Step 5b:
Fit the 4 roof purlins.
* Sleeve together the four 25 x 25mm aluminium lengthways purlins using each length only in order as shown in the below table for your
tunnelhouse size. When joining the purlins keep the white Polyguard tape on the same side for their full length (this will face to the
outside when installed) See image PR1 page 6
Use 2 x 16mm screws to join the purlins - do not screw through the white Polyguard face!
* The end hoop saddles are already pre-fitted for you. Stretch a string line end-to-end between the end saddles and mark the central
hoops with a pencil to find the position of where the internal saddles/purlins will sit.
* Use the saddles and the 16mm screws supplied to attach the purlins to the underside of your central hoops. See image P2
page 6.
* Wrap a small piece of Polyguard around the ends of each purlin to help protect the end wall covering, See image P3 page 6
* If you have a 15m or longer tunnel, or have an X wind kit option you can fit the collar tie braces See image CT1 page 7
Effective from 31-Oct-23
SAD1 (Internal hoop saddle + screws after the cover installed)
See YouTube video "Mk2 Purlin assembly"
See YouTube video "Mk 2 purlins being installed"
See the YouTube video "Roof vent part 1, vent base"
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