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How to build Indian project greenhouse with roofing sheets

STEP 1. The greenhouse base
STEP 2. The side walls
STEP 3. The roof frames
STEP 4. The end walls
STEP 5. The windows
STEP 6. The doors
STEP 7. The greenhouse cover Materials and quantities

This greenhouse is 2400mm wide x 3000mm long. It is lightweight, portable (can be fixed more permanently if required), inexpensive and easy to construct. The cover is clear UV-resistant polythene film. This greenhouse is ideal for using in those areas with a tendency to suffer just enough winter frosts to be annoying.

Timber and timber size. The timber used in this project is 'sawn' also called rough sawn or rough timber. That means that the timber has not been dressed (surfaced, planed or gauged). If you prefer to used dressed timber, then the sizes (width and thickness) of the timber will differ. For example; a piece of 75mm x50mm timber when dressed will end up being approximately 70mm x45mm. If you use dressed timber some measurement adjustments will need to be made to compensate for the difference in timber size. Where to place the greenhouse. Pick a site likely to get the most benefit of winter sun. The site should not be in an area that could be boggy and should be level or in a place that is easy to make level. If the site is below a hill or slope, then it might be necessary to put in a drain (open, tile or scoria) to re-direct any water flow away from the greenhouse site.

STEP 1. The greenhouse base:
Once the level greenhouse site has been chosen, construct the base out of 100x100 treated sawn timber. This timber is readily available at any timber merchants and commonly used for fence posts. Standard lengths are 2400mm and 3000mm. Make an oblong 3000mm x 2400mm as shown in the drawing above. Fix the timber together in the corners by using galvanized nails and nail plates. Check that the two diagonal measurements are equal and if they are not, make any necessary adjustments. When the diagonals are equal, then the base is square. Check that the base is level, either by using a spirit level and a straight edge or by using the water level method Secure the base in place by hammering pegs around the perimeter. Nail the pegs to the base and cut flush any pegs protruding higher than the base timber.

STEP 2. The side walls:
Construct all the framing out of 75x50 treated sawn timber. This timber is readily available at any timber merchants and usually comes in lengths of 4800mm. It is commonly used for fence rails. On a flat piece of ground, make two side wall frames as per dimensions shown in the drawing above. Make the diagonal measurements equal (in the same way as with the base in Step 1) and when the walls are square, cut and fix the bracing members in place. (See above drawing.) Stand the two side walls upright and temporarily prop up in place on top of the base. Fix the bottom plate of the side walls to the base boards with galvanized nails.
STEP 3. The roof frames:
Cut all roof frame pieces as per dimensions shown above. Use 75x50 treated sawn timber. In total, cut 5 rafters @ 1900mm, 5 rafters @ 1310mm and 5 uprights @ 327mm, all with end angle cuts as shown in drawing. Also cut five triangular gussets 500mmx500mmx500mm from a sheet of 7mm treated plywood. Make up the five roof frames to the pattern and dimensions (as shown in the above drawing) on a flat piece of ground. Ensure the two furthest points are 2400mm apart and then nail the triangular gussets in place with galvanized flathead nails spaced about 50mm apart, one gusset to each roof frame. Lift the 5 roof frames in place on top of the side walls: one roof frame to each end of the side walls and the other three spaced evenly in between. Fix the roof frames to the side wall top plate with galvanized nails. Temporarily prop the two end roof frames plumb (vertical). Nail the fascia board (150x50 treated board) to the top of the roof frames as shown below, making sure all the roof frames are vertical and parallel with each other. Fix the window support plate (75x50) in place under the roof frame apex and behind the fascia board, as shown in the drawing below. Brace the roof on the side that has no windows. Nail metal strapping from the apex of both end roof frames down to the middle of the side wall top plate.

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Posted by: Sunny on Jul 02 2012

Tags: Construction Building

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