This section is from the book "Modern Buildings, Their Planning, Construction And Equipment Vol2", by G. A. T. Middleton. Also available from Amazon: Modern Buildings.
The deductions and additions of roof timbers, slating, boarding, and felt, and items of gutters, flashings, etc., will be as previously described to Skylights, and the roof of Lantern Light measured as described for Skylights, also the curb, linings, etc. The vertical lights and framing will be measured as follows:-
Measure per foot run. State size and describe.
Measure per foot run in one dimension, but bill in three items; or the groove in the oak cill may be included in the description of the cill.
Intermediate Posts, as last described.
Head, as last described. Notice that this will probably be splayed on top.
Measure per foot super., and describe. State if in small squares, and if fixed or hung. State in the description the number of sashes in the total superficial quantity.
Measure per foot super. Keep separate, squares under 2 feet, 4 feet, 6 feet, etc., super. per square.
If the sashes are grooved for condensation, measure the groove per foot run. If in short lengths, state it, and number the holes.
If sashes are hung on centres, number the sets of cut beads, and state the average length per set.
Measure the deauctions and additions of roof timbers, slating or tiling, boarding and felt, as previously explained. If the dormer has a pitch roof, remember to measure the cuttings to main roof to front and vertical sides only. The remainder will be covered by the cuttings to valleys.
* By this it is meant that the posts are measured their extreme length from end to end of tenons.
The roof of dormer and the valleys, etc., will be measured as described under Roofs. If a flat, then measure as described under Flats.
Where the ridge of a dormer or any ridge abuts against the sloping surface of another roof, remember to take a lead soaker about 18 inches square. Bill it by weight, and number the fixing in Slater or Tiler.
Measure per foot cube, and bill with "Fir framed in roofs."
Measure as to roof boarding, but describe as vertical. Make the same allowances for cuttings. If for lead covering, state that the edges are shot.
If of slate, measure as to slating, but keep separate and call it vertical. At the bottom edge make allowances for both cutting and double eaves course.
If of lead, measure per foot super., and bill by weight. Measure the copper nailing per foot run; number and describe the lead tacks, soldered to back of lead, and screwed with brass screws to inside of boarding. Include the perforation in boarding, or number it separately in Carpenter; or, if soldered dots are used, number "brass screws and soldered dots and sinkings in deal " in one item.
Or, if a Secret Gutter, measure and bill the lead with gutters. Allow 3 inches every 7 feet for passings; take a tilting fillet, and measure the labour dressing lead over fillet per foot run. If the roof is not boarded, take flashing boards per foot super.
Lead Apron to front, usually 12 inches wide; billed with Flashings.