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unit 210 - capentry maintenance ppt 1
1.
Level 2 Diploma
in Site Carpentry © 2013 City and Guilds of London Institute. All rights reserved. 1 of 23 PowerPointpresentation Defects Unit 210: Carry out carpentry maintenance
2.
Level 2 Diploma
in Site Carpentry © 2013 City and Guilds of London Institute. All rights reserved. 2 of 23 Defects Defects can be caused by: • Insects • Fungi • Conversion • Seasoning
3.
Level 2 Diploma
in Site Carpentry © 2013 City and Guilds of London Institute. All rights reserved. 3 of 23 Fungal defects Blue stain Dry rot Wet rot
4.
Level 2 Diploma
in Site Carpentry © 2013 City and Guilds of London Institute. All rights reserved. 4 of 23 Dry rot • Dry rot is serious and is more difficult to eradicate. • Caused by timber having a moisture content above 20% and bad or no ventilation • Timber loses its strength & becomes dry & powdery
5.
Level 2 Diploma
in Site Carpentry © 2013 City and Guilds of London Institute. All rights reserved. 5 of 23 Fungi Fungi spread through & over the surface of the timber forming a mat of cotton wool like threads Image courtesy of Timberwise
6.
Level 2 Diploma
in Site Carpentry © 2013 City and Guilds of London Institute. All rights reserved. 6 of 23 Fungi Spores will even spread through and over brickwork causing structural damage if left untreated.
7.
Level 2 Diploma
in Site Carpentry © 2013 City and Guilds of London Institute. All rights reserved. 7 of 23 Fungi When the fruiting body is fully ripe it starts to discharge millions of spores that attack more vulnerable timber.
8.
Level 2 Diploma
in Site Carpentry © 2013 City and Guilds of London Institute. All rights reserved. 8 of 23 Control Measures • Locate and rectify the source of dampness. • Cut out and remove all decayed timbers with a minimum margin of 600 mm beyond last evidence of fungal decay. • Replace timbers according to building regulations. • Thoroughly clean down all exposed areas. • Treat all timbers with a preservative. • Treat all other surrounding areas with a suitable fungicide.
9.
Level 2 Diploma
in Site Carpentry © 2013 City and Guilds of London Institute. All rights reserved. 9 of 23 Wet rot Typical tell tale signs that wet rot problem include the following: • Look for very dark, damp wood/timber. Prod it with a sharp implement such as a screwdriver. If the wood is very soft and pulpy, this is typically wet rot in progress. • Often wet rot fungus is largely black and typically localised • Look out for dry timber that is easily cracked and crumbles into fine particles
10.
Level 2 Diploma
in Site Carpentry © 2013 City and Guilds of London Institute. All rights reserved. 10 of 23 Wet rot Thank fully, wet rot rarely gets to the stage of structural defects and typically it can be treated by repairing the source of the moisture ingress and drying out the affected timbers. However, where any affected timber has lost its strength, it is best to remove he timber and replace it with new timber treated against the potential germination of wet rot spores. The critical element however is making sure that all the affected areas are treated or wet rot problem will return.
11.
Level 2 Diploma
in Site Carpentry © 2013 City and Guilds of London Institute. All rights reserved. 11 of 23 Insect attack Most of the damage done to timber in the UK is caused by 5 species of insect or woodworm. • Furniture beetle • Death watch beetle • Powder post beetle • House longhorn beetle • Weevil
12.
Level 2 Diploma
in Site Carpentry © 2013 City and Guilds of London Institute. All rights reserved. 12 of 23 Types of insect Weevil Furniture beetle Death watch beetle Long horn beetle All these beetles invade and consume wood and then leave when they have reached maturity.
13.
Level 2 Diploma
in Site Carpentry © 2013 City and Guilds of London Institute. All rights reserved. 13 of 23 Woodworm Woodworm refers to the larvae of all wood boring beetles. Within the woodworm lifecycle, there are 4 main stages : 1. Woodworm begins breeding 2. Woodworm larvae hatch 3. Woodworm larvae start to eat 4. Larvae turn into woodworm beetle
14.
Level 2 Diploma
in Site Carpentry © 2013 City and Guilds of London Institute. All rights reserved. 14 of 23 The woodworm lifecycle
15.
Level 2 Diploma
in Site Carpentry © 2013 City and Guilds of London Institute. All rights reserved. 15 of 23 Timber preservation All timber contains food on which fungi & insects live. The idea behind timber preservation is to poison the food by applying a toxic liquid to the timber. There are 3 main types of timber preservative.
16.
Level 2 Diploma
in Site Carpentry © 2013 City and Guilds of London Institute. All rights reserved. 16 of 23 Coal tar oils • Derived from coal and are dark brown in colour. • It should only be used externally. • It is not available for general public use & strict controls of its use are in place because of • Its carcinogenic properties. • Substitutes are available.
17.
Level 2 Diploma
in Site Carpentry © 2013 City and Guilds of London Institute. All rights reserved. 17 of 23 Water – soluble preservatives • Are toxic chemicals • mixed with water. • They are suitable for both internal & external use • are odourless. • They are prone to leaching out of the timber in wet conditions.
18.
Level 2 Diploma
in Site Carpentry © 2013 City and Guilds of London Institute. All rights reserved. 18 of 23 Solvent preservatives • Toxic chemicals mixed with solvent spirits. • The spirits evaporate after application. • They are flammable. • Some have a strong odour. • They are more expensive but have durable preservation properties.
19.
Level 2 Diploma
in Site Carpentry © 2013 City and Guilds of London Institute. All rights reserved. 19 of 23 Methods of applying preservatives Brush application. Only a surface coating is achieved.
20.
Level 2 Diploma
in Site Carpentry © 2013 City and Guilds of London Institute. All rights reserved. 20 of 23 Methods of applying preservatives Spraying. A better & quicker method of application but again only surface coating is achieved.
21.
Level 2 Diploma
in Site Carpentry © 2013 City and Guilds of London Institute. All rights reserved. 21 of 23 Methods of applying preservatives Dipping or immersing the timber in a tank of preservative. The depth of penetration into the timber depends on how long the timber is immersed.
22.
Level 2 Diploma
in Site Carpentry © 2013 City and Guilds of London Institute. All rights reserved. 22 of 23 Methods of applying preservatives Pressure treatment is the most effective form of timber preservation as all the timber is coated. The timber is placed in a sealed cylinder were the preservative is forced into the cells of the timber under pressure.
23.
Level 2 Diploma
in Site Carpentry © 2013 City and Guilds of London Institute. All rights reserved. 23 of 23 Any questions?
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