Sustainable Materials for Resistant Materials Lesson objective – to understand how to think of materials in terms of sustainability

Timber - Some Suggestions for a New Approach

to Timber Use: Think about whether you really need to use

new timber - Would a secondhand material suffice?

Use the lowest grade and smallest-sized pieces of timber appropriate for the job

- The common practice of ordering full lengths and then cutting them up into small pieces makes no environmental sense at all.

Do not throw out offcuts - Put them aside and use them on the next job.

Use standard and utility appearance-grade timber, rather than select-grade

- Particularly if the surface is going to be painted or otherwise hidden.

Do not ask for blemish-free timber (clear-grade) and do not insist on stringent colour-matching specifications

- This leads to increased wastage and downgrading of timber to lower-value applications.

Consider using furniture made from knotty, or 'feature-grade' timber

It will not only be just as effective, more individual and visually interesting, it will also be cheaper!

Use jointed timbers, whenever possible

- Timber can be joined on its ends by finger-joints and metal nail-plates, or on its width, by glue-laminating.

Be aware that composite beams are more often than not stronger than timber

- They also use less timber in acquiring their strength than clear grade timber beams.

Buy timber from (smaller) sawmillers who can demonstrate a commitment to optimising wood-recovery during milling

- ie, by radial sawing, band-sawing, laser sawing, portable milling, etc.

Ways to Make Your Home or Workplace More Energy-efficient

Construct an entry 'airlock'. Close off the staircase from downstairs rooms to avoid upward

heat loss. Create doorways between living/working areas, and

sleeping/washing areas, etc - so only the living space is heated. Use a fuel-efficient wood burner (make sure the chimney/flue is

sealed off from the room). Place a maximum number of windows on the north side of the

building - minimise glassed areas on other sides. Use double glazing, low-E glass, or drapes - with pelmet

designed to prevent convection movement adjacent to windows. Create passive heat storage - place thermal mass elements in

sunny spaces (eg, masonry or water). Use roof/wall/floor insulation.

www.design-technology.info/resistantmaterials/ This site has many helpful data sheets to help

you draw up your coursework PowerPointFlow diagram help notes

Planning sheet Task

Materials Job to be completed

H&S QC and QA Feedback and

modification

suggestions