Bidding

Wall Calculation

Square off the building the best you can

It's not necessary to add every wall, just get close

Add to get total wall linear feet
Determine wall height

Multiply wall height by the total wall linear feet calculated previously

This is your wall square footage

Roof Calculation

Multiply length x width to get roof square footage

Determine Roof Pitch (see below). Our example uses 1.25

Multiply square footage x roof pitch

This provides the roof surface area square footage

How to determine roof pitch

Click here to see roof pitch chart

Factors to consider:

• The house plans may provide the roof pitch
• Buildings with dormers, many hips/valleys, multiple layers, you will have to add and adjust
• The lowest number you should ever use is 1.1
• Add 5-10% for corrugation
• Use the base number for metal buildings that do not have hips and valleys

Calculating Board Feet (BF)

A board foot is one square foot of foam at 1" thickness

For our example calculation, we are spraying closed cell, 2" on the walls and 3" on the roof deck

The actual depth goal is determined by OC vs. CC, customer request, climate, and desired R-value

Estimating Cost

Each set of closed cell will cover 4,500 board feet*

Costs for spray foam change rapidly, use your current pricing

Always round up to ensure you NEVER run out of foam
*Yield from a set of CC foam can vary dramatically based on the type of foam you are buying. Premium CC foams can offer 4500-5000 BF. Discount CC foams are generally 4000 BF or less.

Why it's important to never run out of foam

You may need to recirculate before your next job
You will need some chemicals in the drums to store your pumps in

Open Cell Calculations

To calculate the same building sprayed with open cell, we start back with our BF calculation

In this example, we are spraying the OC 4" thick on the walls and 7" on the roof

Each set of open cell will cover 15,000 board feet*

Costs for spray foam change rapidly, use your current pricing

Always round up to ensure you NEVER run out of foam
*Yield from a set of OC foam can vary dramatically based on the type of foam you are buying. Premium OC foams can offer up to 18,000 BF. Discount OC foams are generally 15,000 BF or less.