straw tower by CLARA MCCANN https://padlet.com/98263/hjoj15dqd5sa Claras padlet en-us 2016-09-07 16:02:30 UTC 2016-09-15 16:06:32 UTC hello@padlet.com Foundations are usually made of cement blocks, cinder blocks, or poured concrete. They must be properly laid to keep them from sinking, shifting, cracking, or allowing excessive moisture to enter and possibly damage the completed structure. 98263 https://padlet.com/98263/hjoj15dqd5sa/wish/124111425 http://school.eb.com/levels/middle/article/273396]]> 2016-09-15 15:59:28 UTC https://padlet.com/98263/hjoj15dqd5sa/wish/124111425 n a sloping roof, such as a gable roof, the peak of the roof is created by a long horizontal length of heavy lumber called a hip rafter. Rafters extend downward on either side of the hip rafter to rest on the double top plates of the surrounding walls. The rafters are nailed to the double top plates atop the wall studs. Collar beams are sometimes nailed to each end of opposing rafters for added rigidity. 98263 https://padlet.com/98263/hjoj15dqd5sa/wish/124112667 http://school.eb.com/levels/middle/article/273396]]> 2016-09-15 16:02:41 UTC https://padlet.com/98263/hjoj15dqd5sa/wish/124112667 The outside walls of a conventional residence support much of the weight of the structure, but a facade must usually be added to give the residence an attractive appearance. Before these additions can be made, the exterior walls must be closed in. Houses constructed of standard wood frames have sheathing nailed over the studs. This sheathing may be lengths of flat lumber, sheets of plywood, or composition panels. The sheathing adds strength and insulates the house. Vapor barriers applied to the walls prevent the passage and condensation of moisture, which could damage the structure. Asphalt-impregnated building paper, rolled out and tacked to the sheathing, is a typical barrier. Sheets of plastic or metal foil are also used. These may come laminated to the sheathing.In 98263 https://padlet.com/98263/hjoj15dqd5sa/wish/124114094 2016-09-15 16:06:32 UTC https://padlet.com/98263/hjoj15dqd5sa/wish/124114094