Building tech

come from the conifers (evergreens)
which have needles instead of leaves, e.g. pine

finished limber which is further cur

trim ornamently form of woods

Made from Vegetable fibers

pressed into boards

brand name of FIBERBOARD

brand name of GYPSUM boards

standard thickness for double wall partition and ceilings

standard size for drawers, shelves, cabinet and closet doors

standard size for cabinet,closet doors and sub floors

standard size for plywood

has a smooth surface on one side and a screened surface on the other. It is sometimes known as masonite after the man who invented it.

It is flexible and easy to bend. It is suitable for interior use only

denser than the Standard

Brand name of hard boards

standard thickness for double wall partion

standard thickness for drawer and

come from the broad-leaved or
deciduous trees. Most Philippine timber are of this
latter kind

is the softer, younger outer portion
of a tree that lies between the
cambium (formative layer just under
the bark) and the heartwood.

It is more permeable, less durable
and usually lighter in color than the
heartwood.

the portion of the log near
the periphery which is
generally lighter in color
than the central portion.

contains living cells and
takes an active part in the
life process of a tree

it contains more
organic matter than the
central core of the log, it
is more susceptible to
blueing fungi and woodboring insects, and is not
durable.

the older, harder central
portion of a tree

the portion of the log near the periphery

it contains living cells and takes an active part in the life process of a tree

it containsit contains more organic matter than the central core of the log

the older the harder central portion of a tree

it is composed of inactive cells and serves only as mechanical support

what are the properties of wood?

it is caused by the attack of fungi

cracks are lengthwise separation, caused by shrinkage during drying

these are crafts between parallel to the annual rings of growth

these are irregular growths in the body of a tree

these are well defined openings containing solid or liquid pitch between annual rings

the lack of food on the edge or corner of a piece

caused by an equal shrinkage

a distortion of the board
in which the edge is convex or
concave longitudinal.

a distortion of the
board in which the face is
convex or concave
longitudinal.

a distortion of the board
in which the face is convex or
concave across the board.

a distortion of the board
in which one corner is raised

refers to lumber cut tangent to the annual rings or growth
or, in commercial practice, cut with annual rings at an angle
0 to 45

refers to wood cut radially to the annual rings of growth
parallel to the rays or, in commercial practice, cut with the
annual growth rings at an angle 45 to 90.

Lumber less than 2” thick and less than 8”
wide

. Pieces less than 2” thick and at
least 8” wide.

Pieces more than 2” and less
than 5” in any dimension.

Pieces 5” or more on the smallest
dimension

The two most common classifications are

the size of lumber when it is cut from the
log.

Lumber measure is the

When all free water is removed but all absorbed
water remains, the so-called

occurs at moisture content
percentages below the fiber saturation point.

this continues until the vapor
pressure in the air just balances the vapor pressure
on the wood surface.

This condition of dryness of the wood is called

The process of removing moisture from green wood
(wood from freshly-cut logs) is called

the lumber is exposed to the air

in which warm moist air or superheated steam is used to hit the wood and drive out moisture

shrinkage and then stress in the wood develops,
causing

Their growth depends on mild
temperatures and dampness.

live in the ground and
build earthen tubes to reach their food

The only relatively permanent method of arresting
attack is to use lumber that has been given fulllength termite proofing with wood preservatives.
Attention to structural features and sanitation are
also important.

use wood for shelter rather than for food

Wood preservatives used to forestall attack by decay,
fungi, harmful insects and marine borers are divided into
two general groups

Black or brownish oil made
from distilling coal tar.

a mixture of coal-tar or petroleum oils and 50 to 80%
by volume of coal-tar creosotes.

a
mixture
of
petroleum
oils
and
5%
pentachlorophenol.

dissolved in oil, leaving a
clean brown-colored surface. It was used
extensively for lumber and posts when introduced
in the 1930s

Gives protection against decay, insects and fire;
can be painted on; has no objectionable odor

dissolved in water for pressure
treating, producing a product that is clean and
odorless.

The chemicals
commonly used for impregnation are:

PRESSURE TREATED LUMBER AND PLYWOOD
:

products made from a
mixture of wood and other materials

the most common
wood composite

it is
made of several thin plies, or
veneers, of wood that have
been glued together

they are not
durable when exposed to
the weather.

Types of wood

paneling material
made by reducing and
refining wood chips into
small, threadlike fibers

It is sometimes
known as Masonite, after the man who invented it

a type of fiberboard
which is made from wood
fibers glued under heat and
pressure.

a non-combustible
building board

It is designed to
be used without addition of
plaster for walls, ceilings or
partitions

It is extensively used
in “dry-wall” construction,
where plaster is eliminated

for coverstrip jointing;
visible butt - jointed
panelling with clamp fixing
and free suspension

for smooth seamless
jointing; jointless wall
and ceiling panelling

This type is used for surface layer on interior walls and
ceilings

This is used as base layer in multi-ply construction,
where several layers of gypsum boards are desired for
high fire resistance, sound control and strength in walls.

this type is used as a base in a multi-ply
construction of self-supporting (studless) gypsum walls.

For use in fire-rated assemblies, this may be wallboard,
backing board, or coreboard made more fire-resistant
by addition of glass-fiber or other reinforcing materials

This type comes with water-resistant gypsum core and
water-repellant face paper. It maybe used as base for
walls of bathrooms, showers, and other areas exposed
to wetting.

This type is used as fire protection and bracing of
exterior frame walls. It must be protected from the
weather by an exterior facing.

This type is used as a permanent form in the casting of
gypsum concrete roof decks

s comprised of 72%
Portland Cement, 20% mineralized cellulose fibers
derived from recycled materials, and 8% calcium
carbonate

made of small wood chips and base
materials

what are the types of wood molding.