letters and memos
TRANSCRIPT
![Page 1: letters and memos](https://reader036.vdocuments.mx/reader036/viewer/2022081421/554a2a01b4c90526578b4cd6/html5/thumbnails/1.jpg)
PRESENTATION NO 1
PRESENTED TO :SIR TAHIR SULTAN
PRESENTED BY : EVEN GROUPSESSION : 2008-13DATE : 26-01-2009SUBJECT : BUILDING MATERIALS
DEPARTMENT Of ARCHITECTURAL
ENGINEERING
![Page 2: letters and memos](https://reader036.vdocuments.mx/reader036/viewer/2022081421/554a2a01b4c90526578b4cd6/html5/thumbnails/2.jpg)
TOPICS OF PRESENTATION
PAINTING PAINTING NEW WOOD WORK RE-PAINTING WOOD WORK PAINTING OF PLASTER SURFACE ENAMEL PAINTS DISTEMPER TYPES OF PAINTS
![Page 3: letters and memos](https://reader036.vdocuments.mx/reader036/viewer/2022081421/554a2a01b4c90526578b4cd6/html5/thumbnails/3.jpg)
PAINTING.
Painting is defined as the application of paint to a surface either with a brush or by spraying.
![Page 4: letters and memos](https://reader036.vdocuments.mx/reader036/viewer/2022081421/554a2a01b4c90526578b4cd6/html5/thumbnails/4.jpg)
INSTRUCTIONS FOR PAINTING
Characteristics of the surface for painting. Weather conditions. Quality of material used in paints. Quality of brush.
![Page 5: letters and memos](https://reader036.vdocuments.mx/reader036/viewer/2022081421/554a2a01b4c90526578b4cd6/html5/thumbnails/5.jpg)
PAINTING NEW WOOD WORK:
Following points should be attended to before painting new wood work.
Well seasoned timber. Not to paint excessively dry wood. Dry surface. Quality of the surface to be paint. In cause of nails. In cause of knots.
![Page 6: letters and memos](https://reader036.vdocuments.mx/reader036/viewer/2022081421/554a2a01b4c90526578b4cd6/html5/thumbnails/6.jpg)
Knotting
The repairing of knots in timber to make it smooth and easy for painting and other engineering works is called knotting.
KNOTKNOTKnot is a particular type of imperfection in a Knot is a particular type of imperfection in a piece of timber, a knot will appear as a roughly piece of timber, a knot will appear as a roughly circular "solid" piece of wood.circular "solid" piece of wood.
![Page 7: letters and memos](https://reader036.vdocuments.mx/reader036/viewer/2022081421/554a2a01b4c90526578b4cd6/html5/thumbnails/7.jpg)
TYPES OF KNOTTING
Three types of knotting is generally done. These are:
1. Ordinary or size knotting2. Lime knotting3. Patent Knotting
![Page 8: letters and memos](https://reader036.vdocuments.mx/reader036/viewer/2022081421/554a2a01b4c90526578b4cd6/html5/thumbnails/8.jpg)
ORDINARY KNOTTING
i. First a hot coat of ‘red lead +glue+ water’ paste is applied.
ii. Time to dry it.iii. 2nd coat of red lead + linseed oil & thinned
with turpentine oil is applied.
![Page 9: letters and memos](https://reader036.vdocuments.mx/reader036/viewer/2022081421/554a2a01b4c90526578b4cd6/html5/thumbnails/9.jpg)
LIME KNOTTING
i. First the knot is filled with hot lime and left cover with it for 24 hours
ii. After drying it will scrapped.iii. Then knot is coated with ordinary knottingiv. In the last the knot is rubbed smooth with
sand paper.
![Page 10: letters and memos](https://reader036.vdocuments.mx/reader036/viewer/2022081421/554a2a01b4c90526578b4cd6/html5/thumbnails/10.jpg)
PATENT KNOTTING
2 coats of varnish
1litre methylated spirit +250gm of shellac +15gm of red lead
![Page 11: letters and memos](https://reader036.vdocuments.mx/reader036/viewer/2022081421/554a2a01b4c90526578b4cd6/html5/thumbnails/11.jpg)
APPLICATION OF PRIMING COAT.
After knotting priming coat is applied It provides a smooth base for paint 1kg red lead +white lead mixed in 1 litre of oil
STOPPING
oAfter the priming coat is dried, all cracks and holes are filled up with putty .
oWhen putty becomes hard the surface is rubbed with sand paper.
![Page 12: letters and memos](https://reader036.vdocuments.mx/reader036/viewer/2022081421/554a2a01b4c90526578b4cd6/html5/thumbnails/12.jpg)
APPLICATION OF FINISHING COAT
After knotting, priming and stopping the surface is ready for 1 or more coats of paints
Each coat is applied after the first one is dried and has been slightly rubbed with fine glass paper
A little copal varnish is added into final coat to withstand weathering
![Page 13: letters and memos](https://reader036.vdocuments.mx/reader036/viewer/2022081421/554a2a01b4c90526578b4cd6/html5/thumbnails/13.jpg)
REPAINTING WOOD WORK
“It is a process in which the old painted surface is painted again”
![Page 14: letters and memos](https://reader036.vdocuments.mx/reader036/viewer/2022081421/554a2a01b4c90526578b4cd6/html5/thumbnails/14.jpg)
NECESSITY
![Page 15: letters and memos](https://reader036.vdocuments.mx/reader036/viewer/2022081421/554a2a01b4c90526578b4cd6/html5/thumbnails/15.jpg)
DEFECTS AND ITS REMOVAL:Defects
•Unsound,unsightly,blisterig or flaking off
•Disfigured by smoke
•Holes and cracks etc.
Removal of defects•It will remove by application of some paint remover or by burning the paint•1kg glue + 60gm of unslaked lime in 4kg of water is applied on the surface•It will fill up with putty
![Page 16: letters and memos](https://reader036.vdocuments.mx/reader036/viewer/2022081421/554a2a01b4c90526578b4cd6/html5/thumbnails/16.jpg)
NOTE:
Before the application of each coat the surface will be rubbed smooth with sand paper.
Two or three coats of paints is applied till the desired shade is attained