Determinazione Girder e dimensioni Travetti
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Module 7: Floor Systems

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Determinazione Girder e dimensioni Travetti

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Estimating the Quantity of Floor Materials
As the floor in carries the weight of the structure, it is important to determine the material required for it correctly.

• You must be able to recognize special needs such as floor opening, cantilever, and partition support that affect materials requirement.

• Once the needs are determined, you must be able to estimate the quantities of materials needed in order to construct the floor without delay or any added expense such as ordering too much material.

The process begins by checking the building specification for the kinds and dimension of material to be used. It also requires that the blueprint be checked or scaled to determine the dimension of the various components needed.

These include:

• Sills sealer, termite shield, and sill

• Girder or beams

• Joists

• Joist header

• Bridging

• Subflooring
Guidelines for Determining Girder and Joist Sizes
Normally, the sizes of the girders and joists used in a building are specified by the architect or structural engineer who designs the building. However, a carpenter should be familiar with the procedure used to determine girder and joist sizes.

Sizing Girder
The following steps on how to size a girder are keyed to the example first floor plan shown. Assume that a built up girder will be used and the ceiling is drywall (not plaster).

Step 1
Determine the distance

Step 2
Find the girder load width

Step 3
Find the total floor load per square foot carried by the joist and bearing partitions

Step 4
Find the total load on the girder

Step 5
Select the proper size of the girder according to the local codes


Sizing Joists
The following discussion on how to size joists is keyed to example first floor plan shown.

Assume that the plan falls into the 40 pounds live load category and will be built with joist on 16” center and dry wall ceilings.


Step 1
Determine the length of the joists span

Step 2
Determine if there is a dead load on the ceiling

Step 3
Select the proper size of joist




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