Constructing the doors in the warmth of your garage or on a hard flat surface is easier than trying to perform the operation on site (Please see your particular construction manual for door sizes). You will be required to dig a small trench to match your door width and attach the door frame to the hoop profile with P clips. Using a string line, ensure the door frame is in line with the hoop and backfill the trench. To help support the door when sliding, a timber sliding door support rail is fitted from the outer edge of the door post to the inside of the hoop approximately 30cms up from the ground. The sliding door runs on two sets of wheels screwed to the top of the door. These wheels run in an aluminium track which is bolted to the outside of the door lintel after the tunnel has been covered. If the ground is uneven, it might be necessary to cut the bottom of the door to fit (this is the reason nail plates are not fixed in the first instance) Once you are happy the door glides smoothly across the opening, nail a metal plate at each corner across the joint on one side of the door using twisted nails and one across each of the centre joints and cover with polythene panels getting tension on the panel to avoid any creases or wrinkles. If you would like to discover more about the construction of a Polytunnel or Poly tunnels in general, then why not contact us at www.FirstTunnels.co.uk or join our Facebook group at ww.Facebook.com/Polytunnels.
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