Flashcards in Formulas Deck (26)

Loading flashcards...

1

## How do you find number of masonry blocks?

### Linear feet x height x 1.125

2

## How do you calculate for masonry cement?

### Total block/100 x 3

3

## How do you calculate for sand in masonry?

### Bags of cement / 8

4

## How do you calculate for water in masonry?

### 8 x # of bags of cement

5

## How do you create a constant?

### 144 / L x H

6

## How do you calculate PV?

### L x W x H x # of structures

7

## How do you calculate LF?

### PV x 1.1 or 1.05

8

## How do you calculate for LV?

### LF x 1.5

9

## How do you calculate bags of cement for concrete?

### 1/6 x LV

10

## How do you calculate for sand for concrete?

### 2/6 x LV

11

## How do you calculate for gravel for concrete?

### 3/6 x LV

12

## How do you calculate for water?

### 8 x # of bags

13

## 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

14

## How do you find BM?

###
1" or smaller, add 20%

2" or larger, add 10%

15

## How do you find number of sheets needed for roof sheathing?

### (TRL x TBL / 32) x 2

16

## What is the nail formula for framing?

### P = d/6 x BM/100

17

## What is the nail formula for sheathing?

### P = d/4 x BM/100

18

## What is the formula for floor sheathing?

### L x W/32 Round up x 2

19

## What is the stringer formula?

###
H/7.5 = b (rounded off)

H/ b = ft and inches

20

## How do you find rafter length?

###
Half length x run/rise (ex: 6/12)

A2 + B2 = C2

21

## 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

22

## How do you estimate for roof sheathing?

### TRL x TBL / 32 x 2 = sheathing

23

## Formula for calc PV?

### L x W x HT x # of structures

24

## Find LF?

### PV <5400 [PV x 1.1 = LF] PV >5400 [PV x 1.05 = LF]

25

## Find LV?

### LF x 1.5 = LV

26