Traditional Cut Roofs Flashcards
(32 cards)
How far from the gable wall is the first rafter positioned?
50 – 60 mm
What checks should you make on the wall plate before erecting the roof?
Check for level, parallel, square & firmly fixed.
How are the rafters attached to the wallplate?
spike nailed with two 90 -100mm nails.
What is the name of the cut at the top of the common rafter?
Plumb cut.
How is the wall plate lengthened?
Half-lap joint, length 1 ½ times the width of the timber.
What is the name of the joint where the common rafter meets the wallplate?
Birds mouth.
What is the name of the cut at the bottom of the common rafter to allow the soffit to be attached?
Seat cut.
How deep is the birds mouth cut into the common rafter?
1/3 the depth of the rafter.
If the pitch of the roof is 42 degrees what is the plumb cut?
48 degrees.
How are the rafter feet cut to ensure the fascia is fitted straight?
Mark the rafter overhang at both ends of the roof and use a string to mark all the rafters.
Why does the roof require ventilating?
To keep the moisture content below 18 percent and prevent rot and corrosion.
State three different styles of eaves finishing?
Flush eaves, open eaves, closed eaves or sprocket eaves
What type of eaves finishing slows down the rainwater on steep pitched roofs?
Sprocket eaves.
What part of the roof is the guttering attached too?
The fascia board.
What is the name of the roof component that runs along the apex of the roof and acts as a spine?
Ridge.
Where would you find the soffit on a roof?
At the bottom of the rafters attached to the seat cut.
Where would you find a barge board on a roof?
At the Verge.
Name the roof member where the inclined surfaces meet at an internal corner?
Valley rafter.
Name the roof member where the inclined surfaces meet at an external corner?
Hip rafter.
How are the restraint straps installed up the gable wall?
fixed at 2m centres supported on a noggin between trusses and angled bend overhanging into the cavity.
When erecting a traditional roofs what PPE should you be wearing?
Safety boots, hi-vis, hardhat and maybe gloves.
What part of the building regulations covers roof construction?
Part A
What visual safety checks would you carryout on your circular saw before using it to cut the rafters to length?
Check the body of tool for damage, check battery connections, check guard operates correctly, check cable for damage.
What health and safety regulations are complying with when installing a traditional rafter roofs.
HASWA, PUWER, WAHR, PPE reg, Manual handling regs, COSHH
