PLEASE HELP ME 31.Certain problems can arise with roof systems.Which of the foll

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PLEASE HELP ME

31.Certain problems can arise with roof systems.Which of the following statements is or are correct regarding those problems?

i. Moisture build-upo can cause plywood roo fsheathing to delaminate, resulting in loss strength.

ii. if the roof sheathing is too thin, it may allow the roof to sag under the weight load of the shingles.

iii.Rafters that are spaced closer together than the buliding code requires can result in sagging of the roof sheathing.

iv. If the edge of roof sheathing are not supported, it can lead to movement between the panels.

a. Only statments iii. and iv. are correct

b.Only statements ii. and iii. are correct.

c. Only statments ii, iii, iv are correct

d.Only statements i.,ii.,iv are correct

33.Moisture penetration may occur in a house foundation. Which of the following statement(s) is (are) coorect as it relates to a likely cause of moisture penetration?

i.The land surrounding a foundation slopes toward the foundation

ii.The existence of a pressure tank and pump

iii.A home built in an area of a low water table

iv.Close promixity to a river or stream

a. Only statements ii. and iii. are correct

b. Only statements i. and ii. are correct

c.Only statements i. and iv. are correct

d.only statements i., ii., and iii, are correct

Explanation / Answer

31. option d is correct .

due to moistyrure buildup, the strength of the joint of laminates reduces and hence chances of delamination of plywood increases

Thin roof sheathing has lesser flexural stiffness and hence undergoes high sag even under shingles weight

if proper connection at edge of roof sheating is not ensured, then there is no restraint to themnovement of the edge and hence the panels may move

32. option c is correct.

if the land slopes towards the foundatio , the tendenecy of nearby water flowing towards the foundation is very high because water flows from high elevation to low elevation under gravity

if home is built in area very near a river or stream, it is likely that the water table will be high at that location and this enhances the chances of moisture penetration in the foundation

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