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Cold Frame: a Low Wooden Box with a Hinged, Glazed Lid Sloped to the Sun
A cold frame is a low box with a clear roof: a miniature greenhouse for raising seedlings and hardening them off. Build a wooden frame one to two feet tall, glaze a lid, slope it toward the winter sun and hinge it at the back.
The picture: our diagram, the frame in section with its lid toward the sun.
Beginner
A day
Instructions
1
1
Cut the sides
Cut the sides
Cut boards for a box about 1.2 m by 0.6 m, the back higher than the front. Cut the two ends to the slope.
Materials for this step:
Pine Board4 piecesTools needed:
Tape Measure
Pencil
Try Square
Hand Saw2
2
Assemble the box
Assemble the box
Nail the boards into a bottomless box. Oil the wood, inside and out.
Materials for this step:
Nails0.2 kg
Linseed Oil0.3 literTools needed:
Claw HammerTry Square3
3
Glaze the lid
Glaze the lid
Make a frame of board to the box's top. Lay the glass in it and hold it with thin wooden beads nailed round the edge. An old glazed window does the same job.
Materials for this step:
Pine Board1 piece
Glass Pane1 pieceNails0.05 kgTools needed:
Hand SawClaw HammerTape Measure4
4
Hinge and site
Hinge and site
Hinge the lid to the back board. Set the frame on level ground with the low side toward the winter sun. Cut a notched stick to prop the lid open for air on warm days.
Materials for this step:
Butt Hinge2 pieces
Wood Screws12 piecesTools needed:
Brace and Bit
Spirit LevelHand Saw5
5
Lid slope
Lid slope
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Materials
6- 4 piecesPlaceholder
- 0.25 kgPlaceholder
- 0.3 literPlaceholder
- 1 piecePlaceholder
- 2 piecesPlaceholder
- 12 piecesPlaceholder
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