What should be the distance between the rafters

Forms on construction

load load is divided into two types: permanent and temporary effects.

Constant load is divided into such effects:

1. The strength of the structural weight
2. strength of the weight of the roof
3. strength of the weight of the roof and roofing threshold
4. strength of the weight of the ceiling of the attic if it is

Temporary load means:

• Possible precipitation (snow and rain)
• weight people who walk on the roof at the time of its maintenance and operation
• wind force
• strength of the water flow, which can be in the summer

How to calculate

distance calculation between the rafters is also made in view of the material and the diameter of the rafters.Podschety made on the building project stadii architectural organizations.For assembly, we recommend using the special legal and reference documents, which set out the features of the phased arrangement of the legs rafters obreshetochnogo material and other variables.

for buildings homes rarely put down in projects necessary to distance the rafters, mostly because their hopes on the experience of the builder.Very rarely, but it happens that the owners of the site are asked to calculate the number of rafters for the roof construction.

Therefore it is important to first determine the type of roof and attic (it heatable, characteristic of a residential or non-residential status), because it affects the number of rafters and the system as a whole.

Important!Documents for settlements: SNIP 02/02/96 and "Revisions to the SNIP 03/03/97", in which all painted in with o tvetstvie climate map of the Russian Fed e radio.

recommended materials for roof system:

• coniferous trees having humidity 15-25%
• other boards, beams etc.without bloom and other signs of an unhealthy structure

Handle with wood is carefully, because, apply an antiseptic and flame retardants to protect products from decay and possible fire.Type of material and its cross-section, the length of each rafter also determine the payment.

conducted exemplary contributions

Middle pokazatel pitch trusses is 0.6 - 1.0 meters.What factors affect it you already know, so tell the main action counts:

1. Determining the number of roofs length.It should be divided by the distance between the rafters, which you have identified yourself
2. then the number must be okruglit up in a big way.It expresses the number of rafters for the whole of the roof
3. number indicating the part of the roof length is divided by the number of legs and calculated score of progonu between the lines of the rafters, that same step rafters that you calculated earlier
4. step Dlina may vary depending on the roofing materialand from togo, what is the angle of the roof slope.

example is as follows:. Skata length - 17 m, and the distance between the bindings (as already known) - 0.7 m

17 / 0.7 = 25.2 + 1 = 26 meters.This number oznachaet required number of trusses for the construction of the ramp.

Important!For a steep roof with a large angle step rafters should make as large as possible.The reason for this is incomplete load distribution on the roof and supply most of the load on the walls.

Look tab in the next video, in which the author describes in detail the unit truss system.This will help you to complete your calculations.