Certain problems can arise with roof systems. Which of the following statements is (are) correct regarding those problems? i. Moisture build-up can cause plywood roof sheathing to delaminate, resulting in loss of strength. i. If the roof sheathing is too thin, it may allow the roof to sag under the weight load of the shingles. ii. Rafters that are spaced closer together than the building code requires can result in sagging of the roof sheathing. iv. If the edges of roof sheathing are not supported, it can lead to movement between the panels. a Only statements i., ii. and iv. are correct. b Only statements ii., ii. and iv. are correct c Only statements ii and ii are correct. d Only statements ii. and iv. are correct. A variety of window types are marketed in Canada. From the statements listed below, select the statement(s) that is (are) correct with respect to windows. i. As windows have no insulation value, their only function is to let light in. i. Common components of windows include the frame, sash, pane and muntin(s). ii. CSA standards rate windows for air tightness, wind resistance and water tightness. iv. A window that is fixed to the frame and does not open is called a casement window a Only statements i. and ii. are correct. b Only statements i. and ii. are correct. c Only statements ii. and ii. are correct d Only statements i. and iv. are correct