Art and Literature



Why is it called a hammer beam?

They are traditionally timber framed, using short beams projecting from the wall on which the rafters land, essentially a tie beam which has the middle cut out. These short beams are called hammer-beams and give this truss its name.

How does a hammer truss work?

The truss is composed of the hammer beams (red), hammer posts (blue) and hammer braces (green). In this example, a through-tenon connects the hammer beam to the hammer post. A clever notch in the hammer beam makes for an extremely strong connection to the rafter.

What advantage was gained by using hammer beams?

This design has a central arch and is more complex in nature than most other truss types. It lends a sense of old world architecture to the interior, and the style has a heavier, more massive feel than other truss designs. One advantage of Hammer Beam trusses is the use of short members.

How does a Fink truss work?

Fink design trusses are used today for pedestrian bridges and as roof trusses in building construction in an inverted (upside down) form where the lower chord is present and a central upward projecting vertical member and attached diagonals provide the bases for roofing.

What type of wood is used for roof trusses?

Answer: Yes, species combinations like Hem-Fir and Spruce-Pine-Fir are used regularly in truss manufacturing as well as Southern Yellow Pine and, as you mention, Doug Fir-Larch. What you use generally depends on the part of the country you’re in and what is in most plentiful supply.

What is a rafter in construction?

A rafter is defined as one of a series of sloped structural pieces (typically wooden beams) that extend from the hip or ridge to eave, wall plate, or downslope perimeter. They’re designed to support the roof deck, shingles, and everything else that goes with the roof. Rafters are the traditional way to frame a roof.

Where did half timbered houses originate?

Half-timber work was common in China and, in a refined form, in Japan and was used for domestic architecture throughout northern continental Europe, especially Germany and France, until the 17th century. In England it was popular in regions that lacked stone as a building material.

Do Fink trusses need center support?

Generally, you don’t need central support for domestic trusses. In industrial applications, trusses support enormous roofs made from heavy materials and thus generally require central support.

What does a fink truss look like?

A fink truss is the most common type of truss used, especially on homes and pedestrian buildings. The truss has an internal web configuration shaped like a W to give the ultimate strength to material ratio for spans from around 5m to around 9m in span which covers the majority of domestic dwelling being built today.

What is a simple fink truss?

The Fink Roof Truss is a simple webbed truss design that provides the most economical roof solution for roof structures. The fink design enables roof loads to be transferred down to the wallplate. Insulation is fitted by MBC to the bottom chord of the fink roof truss at ceiling level.

How thick should roof trusses be?

We usually opt for the 35mm thickness in timber when designing standard timber roof trusses. This could be for Fink Trusses in a house construction or Queenpost trusses for a garage. Meanwhile, the 46mm thickness option is used for attic trusses due to fire regulation guidelines.

What’s the difference between rafters and trusses?

Rafters and trusses are those that support the roof. Though both rafters and trusses are triangles in shape, the trusses have more triangle webs inside the principle frame. Rafters consist of sloping outer beams which provide support.

How do you rafter a roof?

Why are they called half-timbered houses?

The familiar half-timbered was used informally to mean timber-framed construction in the Middle Ages. For economy, cylindrical logs were cut in half, so one log could be used for two (or more) posts. The shaved side was traditionally on the exterior and everyone knew it to be half the timber.

Why do testing laboratories not test heavy timber members?

Why do testing laboratories not test heavy timber members? All of the following are reasons that a heavy timber building is a conflagration breeder, except: Tremendous amounts of heat transfer from convection currents, which can ignite exposures hundreds of feet away.

How can you tell if a house is timber framed?

The gable wall of a timber frame building will have a timber spandrel panel forming the gable panel (at roof level). On a party wall the panel will be clad with plasterboard. Note that, if a party wall is brick or blockwork, other parts of the building’s structure could still be timber framed.