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August 12, 2017 18:07

Compound of rafters - we understand the intricacies of the construction of the roof

What are the rafters?

Rafters - a strong load-bearing structures, capable of withstanding heavy loads.They are divided into two types: sloping and hanging.The first stop joined by two or three pillars and sloping bolted or nailed.The upper part of the beam rests on skates, the lower - in the mauerlat.To the roof was solid, you should know how to connect rafters correctly, because it affects its longevity and endurance.

Methods compound trusses are divided into two types: mounted to the boom and attachment to mauerlat.Embodiments fastening roof trusses and shape are determined primarily by environmental conditions.So, if the climate is rainy, it is necessary to make a sloping roof.Also the shape of the roof depends on what loft is needed, the volume, or maybe it really is not necessary.Fastening the rafters to the wall:

  • With mauerlat;
  • By podstropilnyh bars and tightening;
  • attachment to the top of the log walls;
  • strapping frame house.

Tip!To properly calculate the entire structure, necessarily need to seek professional help.

General rules

compounds have hanging rafters, there is only one point of support - the wall, causing the horizontal spacer pressure on the entire truss system.In this case, the junction occurs trusses with tightening which is a lumber or board connecting opposing base beam rigidly connected at the tops of the rafters.As a result, it turns bezrasporny triangle associated with the wall.

floor beams are also used for this purpose, arranged perpendicular to the walls, in the same plane as the rafters.In general, such a system is used in the construction of light attics.It should be borne in mind that, as far as light is no future roof rafters and beams mount better to start when it is known that the walls are quite strong and withstand the weight of the structure.This is due to the fact that the rafters will provide a point load on the walls, and not uniform.

beams for ceilings are taken depending on the type of roof.So, for light roofs need not thick beams with cross-section 15x15 cm.Overhangs needed for sufficiently long beams as they at least 550 millimeters should hang on each side.Not always available the necessary number of such beams.In this situation, the compound used along the length of the rafters - joining two beams in a short length desired.

Tip!Connecting beams - it's way out the lack of the required length of material, but if no such problem, it is better not to use such a method.

Detailed description

process consider in detail how the docking rafters.The connection is made the butt.The upper edge is cut at the same angle as the angle of slope of the roof.Further, the beam rests on the opposite rafter itself, and to create tension in the fence, they divorced and propped up slightly from below.

vertical incision is done at the intersection, it will give a perfect seal.After that there is a connection to the rafters ridge, this would require two nails.If they will not be enough - it is an additional attachment with a metal plate or wood trim.

Important!To hammer a nail into a beam must be cut in the opposite butting joists.

It was one way of docking bars, but you can use other - connection on the ridge batten.It is very similar to the first, but most of the complexity of the installation is very ridge beam, and this design is not for everyone.However, when using such a system all the rafters can be set separately from each other.The top of the edge abuts the ridge beam and the lower - at mauerlat.