National 5 Flashcards
(56 cards)
Flashing with weep holes at the bottom of a wall is called _____.
Wall termination flashing
Plastic grid type foundation drainage systems work in conjunction with _____ _____ _____.
Perimeter drainage tile.
1/ _____ is a common gutter slope.
200
A gabion is a type of _____ retaining wall.
Gravity
The most rot resistant wood is _____.
preserved wood foundation pressure treated
Retaining walls require ____ weep holes every _____.
4”
10’
Purlins are required at every _____.
Rafter.
Deck/patio ledger boards should be secured with _____ _____.
Lag bolts
Settlement cracks occur at _____ _____ in a wall.
Weak spots
Ridge boards are typically nominal _____ boards, are ____ size larger than rafters, and sometimes allow opposing rafters to be _____.
1”
one
offset
Skylights should be installed ____” above roof coverings on a roof sloped 3/12 or less.
4”
Modified bitumen has a lifespan of _____ to _____ years.
14-20
Deflection in a roof system could mean _____ defects.
framing
New shingles applied in cold weather could be susceptible to _____ _____ _____ because sealing strips _____ _____.
tabs tearing off
don’t hold
Cutting the points refers to _____ _____.
Asphalt shingles
Clamp on amp meter reads 0 at load element of water heater. This means that _____ _____ _____ is _____ _____ or has a broken _____.
electric water heater is not on
element
Service drop wires are sometimes _____ than service entrance wires, which is normal. The opposite is not.
smaller
An over tightened fuse can cause _____ and bending of the _____.
overheating
Bus bar
Boiler horizontal vent minimum rise is _____ per foot.
1”
A _____ _____ is required for masonry chimneys.
crown cap
Cat III vents minimum distances are controlled by _____ _____.
manufacturer’s instructions
Type B vents must terminate _____ feet from a sidewall.
8’
High efficiency condenser line dripping is _____.
normal
Circulating pumps are located _____ a boiler.
above
