2.5.8.2 Roof Connection

Special method for connecting trusses have been developed because the simple nailed timber joint are not strong enough the bolted metal connection shown they ensure that the timber joints can with stand their loads this section describe a variety of connection.

Special methods for connecting trusses.

• Split – ring connection

• Gang nail plate

• Ply wood gussets

2.5.8.3 Roof Function

A roof on the top of a building fulfills important function

• Keeping out the rain and wind

• Providing shade from the sun

• Keeping the internal cool

• Retaining head in cool weathers

• Ensuring that the structure is properly weighted down

• Roof should meet these basic standards of performance requirement

• Allowing the rain water to flow freely away

• adequate fire resistance

• providing light and ventilation

• Durability

2.5.8.4 Roof Materials

• Depending on material used the roof should be:

- Iron sheets

- Reinforced concrete

- Tiles

-Straus

Figure 7: Roof Trusses

2.6 Finishing Works

2.6.1 Doors and windows

Description of doors

A doors a removable barriers that spades internal and external spaces, it is usually attached to a frame one side by hinges a doors provide the access protection security and privacy.

Function of door

• A door provides access internal space of building.

• A door protects internal spaces by preventing same entering which are not desirable

• Door provide security

2.6.1.1 Standard performance of door and window

A door depending on the type should meet certain standards for;

• weather resistance

• security

• fire resistance

• sound insulation

• privacy

• operation

• durability

2.6.1.2 Type of door

Door mostly used in building are classified into the following types depending upon.

a. Arrangement of different components of door

1. ledged, braced and battened door

b. Method or manners of construction

• framed and paneled door

• flush doors.

• louvered doors

c. Nature of working operation

• revolving doors

• Sliding doors

2.6.2 Plastering

The term plastering means the application of smooth coot of material to wall and ceiling the purpose of plastering is to provide joint less hygienic decorated smooth finish to walls.

Objective of plastering

Plastering is done to achieve the following objects:

a) To protect the external surface agencies penetration of rain water and other atmospheric agencies

b) To give decorative effect

c) To give smooth surface in with dust and dirt cannot lodge

d) To protect surface agents varmint

e) To conceal inferior material or definitive work man ship

Requirement of good plaster

-The plaster material should full fill the following requirements

-It should be hard and durable

-It should pass good workability

-It should be cheap

-It should possible to apply it during all weather condition

- It should effectively check penetration of moisture

The selection of type plaster depends up on the following factors:

• Availability of bending material

• Durability requirement

• Finishing requirement

• Atmospheric condition and variation in weather

• Location of surface