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formaldehyde and polyester resins. We are interested in using paper pulp and urea- formaldehyde resins for corrugated roofing sheets. Cotton matting with polyester resins for moulded articles (FRP analogs) has been attempted. 7. Angle iron frame houses: With a small workshop with only Rs. 7500 investment, one can easily build modular frames that can be assembled to make a house in 3-4 days. The wall frames are made from 30x30x30mm. angles and corners with 40x40x5 mm. Each frame is 1x2.5m. and has three segments for ventilators, windows and for brick wall with sill at the bottom. Roofing is also angle iron frame with trusses, rafters and purlins. The grid of 20x20x3mm. with 30x30x3mm, rafters gives good rigidity to the structure. Rigidity of Walls; is increased by brick walls up to 1 m height. 8. Doors & Windows: These are still presenting a problem. Panel doors and window shutters, are not only expensive, but also unsatisfactory because of excessive shrinkage, expansion and warping. The labour cost is also more. Block board has been easier to use, is light, looks neat and is entirely satisfactory for indoor use. We are testing outdoor use with protective coats. Painting of plywood and block board consumes more paint and there is scope for treatment of these for standing weathering (urea-formaldehyde resins) We have tried angle iron frames with paper cement panels for WC/bath doors. They are not very rigid, tend to twist, but are otherwise satisfactory. 9. Geodesic Domes: Geodesic domes of angle iron frames with chicken mesh skin and mortared after centering from inside, may be an approach for reducing cost still further. < Rural Development Through Education System 247
