Formulas Flashcards
How do you find number of masonry blocks?
Linear feet x height x 1.125
How do you calculate for masonry cement?
Total block/100 x 3
How do you calculate for sand in masonry?
Bags of cement / 8
How do you calculate for water in masonry?
8 x # of bags of cement
How do you create a constant?
144 / L x H
How do you calculate PV?
L x W x H x # of structures
How do you calculate LF?
PV x 1.1 or 1.05
How do you calculate for LV?
LF x 1.5
How do you calculate bags of cement for concrete?
1/6 x LV
How do you calculate for sand for concrete?
2/6 x LV
How do you calculate for gravel for concrete?
3/6 x LV
How do you calculate for water?
8 x # of bags
How do you calculate for BF?
BF= T x W x L x # of pieces / 12 or 144
- if L = ft 12
- if L = in 144
How do you find BM?
1” or smaller, add 20%
2” or larger, add 10%
How do you find number of sheets needed for roof sheathing?
(TRL x TBL / 32) x 2
What is the nail formula for framing?
P = d/6 x BM/100
What is the nail formula for sheathing?
P = d/4 x BM/100
What is the formula for floor sheathing?
L x W/32 Round up x 2
What is the stringer formula?
H/7.5 = b (rounded off)
H/ b = ft and inches
How do you find rafter length?
Half length x run/rise (ex: 6/12)
A2 + B2 = C2
How do you find the number of truss/rafters?
of roof members = building length/o.c. Spacing. Round up +1
- rafter spacing = 1.33
- truss spacing = 2
How do you estimate for roof sheathing?
TRL x TBL / 32 x 2 = sheathing
Formula for calc PV?
L x W x HT x # of structures
Find LF?
PV <5400 [PV x 1.1 = LF] PV >5400 [PV x 1.05 = LF]
Find LV?
LF x 1.5 = LV
Calculate total bags, tons of sand, gravel for concrete?
(LV / 1) x 6 = bags. (LV / 2) x 6 = tons of sand. (LV / 3) x 6 = gravel. bags x 8 = gal of water
