BT-1 Reviewer PDF

## SEMESTER 2 (P1) - BUILDING TECHNOLOGY 1 REVIEWER ### SCIENTIFIC BACKGROUND #### (HARDWOOD) #### RADIAL SAWING (QUARTER SAWING)HYLLA) Log is native to central Mexico to southern dimension lumber, where it’s perpendicular to the growth rings. It is hard and only true commercially grown mahogany...

## SEMESTER 2 (P1) - BUILDING TECHNOLOGY 1 REVIEWER ### SCIENTIFIC BACKGROUND #### (HARDWOOD) #### RADIAL SAWING (QUARTER SAWING)HYLLA) Log is native to central Mexico to southern dimension lumber, where it’s perpendicular to the growth rings. It is hard and only true commercially grown mahogany species. #### SEASONING TIMBER After sawing, lumber undergoes a controlled drying process. Mahogany grows slower but wood defects are lessened in 15-20 years to reduce its moisture content to suitable levels for construction. #### KNOT Does NOT implies to the controlled drying rate from the trunk. #### WOOD CHECK (MC) Moisture content (MC) in any piece of wood is a representation of water fibers along the rays over dry weight. #### NARRA Surface of wood dries faster than its inside in the Philippines’ national #### FORMULA W/ SAMPLE SOLUTION - **WOOD SHAKE** MC= WEIGHT OF WATER IN furniture WOOD WEIGHT OF WOOD FIBER IN WEIGHT OF WATER x 100 Lumber is thriving and musical instruments. - 6 KG- wood during the growth of the tree considered vulnerable but highly desired. - **AFTER DRYING WOOD IS NOW 4.5 KG** - **WOOD SPLIT** MOLAV= 1.2 KG (weight of water in wood) Complete separation of wood A valuable Philippine tree. - WEIGHT OF WATER WHENWOOD IS COMPLETE, 1.5 KG. - Weight of wood is 4.5 KG. - WANE is reduction to 33%. - Among the most expensive lumber. Absence of wood presence of bark & the corners. - GREEN LUMBER VS DRY/ SEASONED LUMBER with violet flowers. - BOW, CROOK, CUP, TWIST #### WOOD DEFECTS AND DEFORMATIONS ### 2 TYPES OF WOOD #### (SOFTWOOD) #### TYPES OF SEASONING - **KILN DRYING** Usually softer materials. Almost always light. Suitable for wood used in show up in the wood grain. - **ENGINEERED WOOD** Loose and wood aged/looking. Gmelinia (Gmelina arborea) Moisture content without causing structural applications. Do not bear a fair drying. - **AIR DRYING** Pre-mature/extend. Glulam serves as with leaves that strongly resist weather. - **LAMINATED** allows resistant wood. - **Hardwoods,** used in furniture. - Dimension lumber greater where construction and planer to pulp content by about 0.4%. - **PLYWOOD DRYING** 30 m3- every batch. It must be solid wood to prevent and trend 50 cm in gluerogger in drying. - Chemical drying – High value strength, tensile. - **BLOCK BOARD** Softwood, thick glued together to form an anhydrous chemical production of wood - **ANGIOSPERMS** To, slow, moisture and deciduous shedding leaves and logs have an annual, usually occurring leaves annually. - **ENGINEERED WOOD** - **MELAMINE** - 4 SIDE 80%. Lumber members to laminate and sheets up in a place to (differ to each state), usually involves a swollen between. - **HEAT RESISTANCE** - **PLYWOOD IS 15% WOOD CAN BE** - Particleboard (chipboard) made, with (person) using pipings and shavings with resin as binder. - **THE SAWYER** - **LUMBER SURFACING** - **MDF/HDF** Medium/non density. - Products of different value of wood through the surfaces of 1 side breaking down wood residuals into 2, different areas of one point. - When trees cut, cut into 2, trees cut into 2. - **FLATS SAWING (PLAIN SAWING) ** - Wood 45% it is facing or also, the cores are such that grow rings can be cut new surface 1 side, boards are cut such that growth rings can be oriented strand board to the middle and name, have display a bigger surface resulting in varied them patterns. Together by heat ### LUMBER CLASSIFICATIONS