Splicing the rafters - the basic techniques and features

Extension rafters - why do we need to know?

supporting structure pitched roof of the building is called the rafters.They consist of uprights, struts and laid sloping rafters.Recent lower ends do not rely on the walls themselves, and to the special support beams - mauerlat.

supports for the upper ends of the beam-to-Run is mounted on a vertical rack system.The project includes building a strictly defined roof structure with predetermined parameters.For example, the rafter length being determined the geometrical dimensions of the ramp, and their cross section depends on the estimated load on the rafters.The same goes for all the design elements.Increasing

same size boards, pillars or beams in the vertical direction is known by the term "capacity trusses", and here the two parts form a straight line axis.But splicing is conducted in the horizontal direction and is often applied to increase the length of the rafters.

How to extend the rafters to roof did not fall?

Extension rafters made notching with subsequent fixation staples, nails, screws, etc.Tools for carpentry work varied, and the first among them is the ax, with which performed works such as cuttings device, rebating, Tesco, zakolachivanie nails and staples and many other operations.

surface hewn with an ax, undergoes a more thorough treatment of a plane, Medvedkov, plows and sherhebelem.The grooves and hollowed out nest bit, to clean up the cuttings used chisel.Holes reams auger with a variety of tips.

Splicing rafters in length require the use of various types of saws: hacksaw, Luchkova transverse.Also need a hammer and a mallet.In addition, mention, how to splice rafters in length, it is impossible not to mention about the general requirements for cuttings:

• notching must be constructed in such a way as to withstand all the loads transmitted;
• at the junction of the two elements all plane sections must adhere perfectly to each other;
• avoid rotting desirable to take measures to prevent falling and stagnant water;
• should use metal fasteners to resist the possibility of accidental loads, if necessary;
• possible, you should choose a simpler form notching.

Splicing rafters - how to proceed?

Now that you know the basic principles, you can think about how to extend the house rafters without changing the estimated strength of the structure.Let's start with how to increase vertical rafters.The easiest way - back to back with the insert pin with notches, which is necessary to deter casual side loads.

more laborious method - a build-up with a spike.Here, the lateral loads will discourage made at the end of one log tenon part of the hollowed out at the end of the other groove.

Finally, we look at how to splice rafter length.There are several ways, but the most simple and reliable methods are direct and oblique lining.In the former case the ends of the logs joined rectangular notching made on the thickness and half the timber length at twice the thickness.

Two log notching folded and sealed with metal nails or staples.In the case of an oblique angle notching covers much more than dumb.In principle, these are the foundations of refinement length beams to be aware of when custom layouts of your roof.