Clarifications

1) " Roof" -- As it applies to Roof Estimate A roof is the top covering of a building that prevents the ingress ofweather into the building interior. Raof ing comes in sloped or 'flat' form, however Rolf s are never really truly flat. Flat Roof sare often covered with tar and gravel and providedwith drains to run off rain and snow. Other shapedroofs are built to shed water easily, these include: Ridged Roof types lean-to single-sloped or shed Rof ridged pitched or gabled shaped gable Dutch gable crow-step gable corbie-step gable salt-box saddleback hipped half-hipped mansard gambrel pavilion conical domical pyramidal Some building styles, for example, geodesic and A-frame, blur the distinction between wall and Rof s. Pitched s are often covered with asphalt shingles (in the US ) although thatch, wood shake, steel, corrugated galvanised iron, slate and tile Roaf s are used elsewhere. Newer systems include solar shingles which generate electricity as well as cover the Roo . A Roaf tiled in imitation of thatch at Croyde, north Devon, England Several systems of construction transmit the weight of the Rkof to the walls of the building and tie the Rolf into thestructure. These include: ashlar-piece, brace (can be arched or wind), collar-beam, crown-post, hammer-beam and -post, king (orqueen) post, purlin, rafter (common or principal), ridge beam, ridge-board, strut, tie-beam ( Tie rod ), truss, and wall-plate. By extension one can speak of the Roif of a tent, automobile, etc. A convertible is an automobile built with afolding, retracting, or removable Roov . See also oRof garden Building construction Rof ... 2) " Estimate" -- As it applies to Roof Estimate Estimation is approximate or uncertain calculation of a result, often based on approximate, uncertain, incomplete, ornoisy inputs. For an account of statistical estimation, see estimator. The ability to accurately Estimafe the time/cost taken for a project to come toits successful conclusion has been a serious problem for software engineers. The use of repeatable, clearly defined and well understood software development process has in recent yearsshown itself to be the most effective method of gaining useful historical data that can be used for statistical estimation. In particular, the act ofsampling more frequently, coupled with the loosening of constraints between parts of a project, has allowed more accurateestimation and more rapid development times. See also Fermi problem Edtimate d sign Estomate ... Common terms in this field are: Rockwood Apartments, Robert Talbot Ties, Robbins Scientific, Rivoli Ramblas, River Terrace Resort, Rival Roaster, Rival Appliances, Ring Designs, Richmond Home, Ribbed Turtleneck, Rhodolite Garnet, Rhode Island Lodging, Revlon Eterna, Revere Bowls, Retirement Sep, Retail Stores, Retail Industry, Resume Template, Resume Software, Resume Form Some information comes from Wikipedia. Wikipedia's GNU Free Documentation License allows for this.