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How to build a Greenhouse

STEP 4. The end walls   Page 2 of 2  

greenhouse end wall frames

Ensure side walls are plumb (vertical).

For all wall framing use 75x50 treated sawn timber.

Cut studs (a) to size and fix in place. They should be 700mm apart to allow for the door.

Cut top plates (b) and (c) to size and fix in place.

Cut bottom plates (d) to size and fix in place.

Measure, cut and fix the bracing timbers (e) in place.

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STEP 5. The windows

greenhouse windows

For the windows use 50x50 treated sawn timber for the top and bottom frames and 75x50 treated timber for the side and middle mullions.

Angle cut the bottom of the window frame 30 degrees (the same pitch as the roof).

Make two windows as per dimensions above. Fix in place with two butt hinges on each window screwed to the top frames of the windows and the window support plate.

Fit a window latch to each window.

Measure, cut and fix a row of nogs* (*blocking, short pieces of timber set between the rafters) below the window and in between the roof frames as per the above drawing.

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STEP 6. The doors

greenhouse door

Construct the doors (2, one each end of the green house) as per above dimensions.

Use 50x50 treated timber for the frames and cut the gussets from 7mm treated plywood.

Make the door frames up on an even piece of ground. Ensure frames are square and then nail the gussets in place on both sides of the doors.
Hinge the doors in place and fit handles or padbolts of your choice.

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STEP 7. The greenhouse cover

Cover the greenhouse with UV-resistant polythene.

Hold the coverings in place by laying thin battens over the polythene (when the polythene is taut) and nailing the battens to the greenhouse studs, roof rafters etc.

Cover the doors and windows also.

Most hardware merchants or garden suppliers only stock the standard plastic polythene that is not UV resistant but they should be able to advise you where to get the polythene required for the greenhouse covering.

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Materials and quantities

Item Description
100m of 75x50 treated timber framing; rip down for battens, doors and windows
Misc nails, plates, strapping, hinges, handles etc
11m of 100x100 treated timber base
3m 150x50 treated timber fascia
2400x1200x7mm treated plywood gussets
30sq m ultra-violet-resistant polythene covering

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