Using Wood

Wood is a natural beautiful living material that will enhance any environment. Modern manufacturing tequniques ensure that all our products are energy-efficienct, proofed against extreme climatic conditions, secure, improve noise reduction and are low maintenance.

The majority of the material sections we use are of laminated construction. We have been doing this for more than 10 years, so we understand the needs and requirements. It enables the best of materials to be used on the outside faces, where it really matters, and the lessor grades or material with the defects removed, for the central core of the section.

Further benifits to this material mean improved stability, more certainty regarding the moisture content and a consistency of quality. It is often referred to as engineered material, and that concept mirrors precisely our manufacturing principles.


We use three main types of timber in our window and door production, though we can always consider alternatives if a situation demands.


Accoya has become our preferred timber to use for our windows and doors. It is a plantation grown, engineered wood with many great properties. Quite simply we feel it is the best material choice for timber windows and doors in our Scottish climate. Due to its quick growth and long lifespan it also boasts some impressive eco- credentials.

Accoya wood is the perfect material for wooden window frames, external wooden doors and exterior window shutters as it offers improved thermal insulation properties in comparison with commonly used hardwood and softwood wood species and it is more durable and dimensionally stable than the best tropical hardwoods. Accoya wood has an enhanced coatings performance and can last twice as long, saving time, money and hassle. It also has a 50 year above ground guarantee, giving complete confidence that Accoya windows and doors will stand the test of time. An Accoya wooden window or door is developed to excel in external applications, even in challenging conditions. You can find further information about Accoya here and by clicking the link below to an information video on you tube.

The tropical hardwood we use is :


Shorea pauciflora King. S. curtisii Dyer ex King (in part), S. acuminata (in part), S. platycarpa (in part), S. platyclados are the principal species producing dark red meranti from Malaysia. The alternative Malaysian name for the wood of S. pauciflora is nemesu. Shorea pauciflora King. is the principal species producing dark red seraya from Sabah, locally known also as oba suluk.
Not listed in CITES. Believed available from well-managed sources. Check certification status with suppliers.

The Tree
The various species of Shorea grow to a height of 45m or so and a diameter of 1.2m or a little more, with long, clean, cylindrical boles above small buttresses.

The Timber
Sapwood lighter in colour and distinct from the heartwood which is red-brown darkening to a dark red; planed surfaces fairly lustrous, stripe figure on radial surfaces. Grey-coloured narrow streaks are often present on all longitudinal surfaces, caused by concentric layers of resin canals. The texture is rather coarse but even, and the grain is interlocked and wavy. The wood weighs on average, 710 kg/m³ when dried.

Slightly durable (Can vary in durability)
The temperate hardwood we use is either American White Oak or European Oak:


The genus Quercus with more than two hundred separate species produces the true oaks. Most of these are found in the northern hemisphere where, in temperate regions they may form pure stands, or may be dominant species in mixed wood lands, while in warmer countries they tend to occupy the mountain areas. Most of the true oaks are trees but some are shrubs. The trees, on the basis of wood structure, fall into three groups; the red oaks, the white oaks, and the evergreen oaks or live oaks; the red and white oaks are deciduous.

Not listed in CITES. Believed available from well-managed sources. Check certification status with suppliers.

The Tree
Both species reach a height of 18m to 30m or a little more depending upon growth conditions which also affect the length of the bole. When drawn up in forests at the expense of their branches, this may be 1 5m or so in length, but in open situations, the tree branches much lower down. Diameters are about 1.2m to 2m.

The Timber
There is no essential difference in the appearance of the wood of either species. The sapwood is 25mm to 50mm wide and lighter in colour than the heartwood which is yellowish-brown. Quarter-sawn surfaces show a distinct silver-grain figure due to the broad rays. The annual rings are clearly marked by alternating zones of early-wood consisting of large pores, and dense late-wood.

Conditions of growth accordingly govern the character of the wood to a great extent; for example, in slowly grown wood the proportion of dense late-wood is reduced in each annual growth-ring, thus tending to make the wood soft and light in weight. The growth conditions in the various countries which export oak, vary considerably. Baltic countries, including northern Poland, produce oak which is generally hard and tough, but further south in Poland the growth conditions become more favourable to the production of milder, more uniformly-grown oak, the rich black soil of south-east Poland producing the famous Volhynian oak, the character of this type of wood changing but little in countries in Central Europe such as Czechoslovakia and Hungary, but being generally a little milder in character in Yugoslavia, from whence Slavonian oak is shipped.

The weight of oak varies according to type; that from the Baltic area, western Europe, and Great Britain being about 720 kg/m³ and that from Central Europe about 672 kg/m³ on average after drying. So-called brown oak is the result of fungus attack in the growing tree. The fungus, Fistulina hepatica, causes the wood first to assume a yellow colour, then a richer brown or reddish-brown. A yellow-coloured streak sometimes appearing in oak is the result of another fungus, Polyporous dryadeus, but since very few tree diseases persist after the tree is felled, dried timber is no different from normal coloured wood, indeed, brown oak is often preferred for its decorative appeal.



Generally we use a standard range of ironmongary and fittings of a quality and design with which we are comfortable, and a performance that compliments our technical goals. Should a standard product not meet a clients ideal, we are happy to source alternatives or fit a customers own supply.

Casement hinges are Securistyle stainless steel, side or top hung
Reversible hinges are Grurud top turn.
Handles are usually Hoppe, with a range of finish options.
Espag locks are Roto twin cam.
Trickle vents are Titon.

Hinges are Columbus 2D or 3D adjustable in a range of finish options.
Locks are KFV multipoint (2 pin and central shootbolt)
Handles are Hoppe as for the window handles.
Thresholds are Stormguard mobility either silver or gold.
Letterplates match the handle finish.


We source all our glazing units from Ravensby Glass in Dundee and our standard fitment is:

4mm clear or patterned glass outer pane
16mm or 20mm cavity with a warm edge spacer bar and argon gas fill.
4mm softcoat low-e inner pane.

This gives a centre pane u-value of  1.2 which we believe in most cases to be the best compromise between performance and cost. We can supply higher performing glazing units, but at increased cost, and are happy to discuss specific options and requirements. The pdf attachment shows a typical window u-value calculation.

As with all aspects of specification, we welcome visitors to our factory and showroom, both  to view and discuss all the alternatives

U-Value calculation

Surface finish

Factory Finishing.The term factory finishing applies when the items supplied to site have been completely treated with all the various coatings necessary to comply with the paint manufacturers specification. We are now using products from "SHERWIN-WILLIAMS" and pride ourselves that by following their recommendations implicitly, together with a modern purpose equiped paintshop, we are able to give the very best finish to all our products.

This ensures that all surfaces are treated (not just the ones that are seen), and that the componants are clean and dry prior to coating. This is esential for a successful result and explains why it is almost impossible to achieve on site.

The Process:
The initial coats, which comprise a preservative and then a basecoat primer, are both applied automatically using a "Flow Coater". This is a machine which bombards all surfaces with the material, ensuring both the full coverage and correct penetration.

The next stage is to manually treat all areas of exposed end grain with a sealer. This is a very labour intensive operation and one that many other companies omit. If you imagine that wood is like a cut flower, just as the flower stem sucks up water, so too will the end grain of timber. The sealer is designed to prevent this and is very important to the performance of a finish.We then spray apply two coats of top coat, either translucent or an opaque finish.

We are able to measure the thickness of coating and this also is important to the correct performance, and is generally equivalent to at least 8 brush coats.

All the materials used are water based and micropourous, and widely acknowledged to be amongst the best available.

Over recent years, the trend has been towards a solid colour finish. This can be a RAL or BS shade, or SHERWIN-WILLIAMS can provide a match  to any particular shade. We also continue to offer a range of translucent stains though the final shade is dependant on the raw material colour and exact matches can never be guarenteed. There is also a special material available to us, to enable the various aluminium componants such as glazing beads and vent canopies to be colour matched to a solid colour.

Another popular option is to apply a two-tone finish. This is where we apply a differant colour to the inside and outside of a product. In summary, most things are possible, we are always pleased to discuss your needs.

Many factors effect the maintenance requirements of a timber window or door, not least are the colour, the amount of exposure, the type of timber used and many others. One golden rule is that an opaque colour will outlast a stain, and a dark stain will outlast a light one. A clear finish would never be recommended for an external application. For further information please download the pdf datasheet: "Surface Finish Maintainance Sheet"

Surface finish maintenance sheet
SHERWIN-WILLIAMS -Coating solutions

Care & maintenance

Having invested in the highest quality windows and doors, it is important that a few simple rules are observed to ensure they continue to look good and perform well.The installation should be correct and initial dirt and debris should be washed off using a very mild soapy water. Therafter this should be repeated at least twice a year to remove airbourne contaminants. Any small areas of damage should immediately be repaired to stop water ingress into the bare wood.

Ironmongery items such as locks, hinges, handles etc, should all be routinely lubricated with a light oil or spray. Sliding gaskets on patio doors and sash and case windows will benifit from an occaisional application of a silicon spray. Once surface areas show signs fading, ensure a recoating operation is scheduled for the first spell of suitable weather.

All items are supplied complete with installation and maintenance sheets and these can all be accessed in pdf format here:

Patio C&M sheet
Door & Doorset maintenance sheet
Window maintenance sheet

Terms and Conditions

This document details the following conditions of sale in which Treecraft Woodwork Ltd. is
referred to as "the Company".

1. Validity of quotation
No order received from a customer by the Company shall constitute a contract unless the customer has signed the order form.

2. Prices
Prices quoted by the Company are firm for 30 days only or until previously withdrawn. Unless otherwise stated, all prices are exclusive of any applicable value added tax, for which the customer shall be additionally liable to the Company.

3. Delivery
Delivery periods and dates are given in good faith, but are not subject of any warranty or condition, and time shall not be of the essence of the contact in these respects. No liability will attach to the Company if delivery periods or dates are not met for any reason whatsoever.

4. Payment
Orders for customer's without an account are accepted only if a 25% deposit is paid with the order and the balance at uplift/delivery. Accounts are opened subject to approval of references and credit checks unless otherwise agreed by the Company, payment is due 30 days from date of invoice. If payment is not made within these payment terms, the customer shall pay the Company interest at the rate of 4% per annum above the base rate of Bank of Scotland from the due date for payment until the date of actual payment. Payment can be made by cheque, BACS, Debit or Credit Card (Credit Cards incur an additional fee of 2%).

5. Warranty
The company warrants that all goods supplied by it will correspond to their specification and will be free of defects in materials or workmanship for a period of 5 years from the date of delivery. The company's obligation in the event of a breach of this warranty is limited to the repair or replacement of any defective goods which will be made solely at our discretion.
This warranty is given in lieu of all other warranties or conditions expressed or implied (whether by statue or otherwise) and is subject to the following conditions.
Claims must be notified in writing to the company within seven days from the date of delivery or (where the defect is not apparent on reasonable inspection) as soon as practicable after discovery of the defect.
The warrant is NOT transferrable.
The company reserves the right to charge for any site visit if upon inspection the item is defective due to incorrect adjustment or poor installation or maintenance.
Accoya products are covered by their own manufacturers guarantee details can be found using this link: Accoya Warranty - Unrivalled 50 Year Warranty - Highly Tested

Warranty Exclusions
Any visible defect not reported before fitting
Any defect or failure of the goods arising from any drawing, design or specification supplied by the customer.
Any defect or failure, in the reasonable opinion of the company , arising from wilful damage, or alteration or repair of the goos without the company's prior approval.
Normal shrinkage or swelling of internal or external timber products.
Good site practice with regard to conditioning is the customers responsibility.
Any items have not been properly maintained by the customer or any third party. A copy of our maintenance instructions can be found on our website or requested by email.
Any goods that have not been paid in full.
Parts, materials or equipment not manufactured by the company, in respect of which the customer shall be entitled only to the benefit of any such warranty or guarantee as given by the manufacturer to the company.
Re-decoration or installation cost of any replacement supplied.
Any electrical components will be covered for a period of 12 months,
Door threshold seals can be subject can be subject to excessive wear depending on use. Warranty replacements are supply only, for a period of 12 months.
Costs associated with any access or lifting equipment should it be required to carry out any warranty work or inspection on site,
Variation of the colour or grain of clear or stained timber.
Naturally occurring shapes in the timber.
Except in the case of death or personal injury caused by the company's negligence, the company shall not be liable for any consequential loss or damage (whether for loss of profit or otherwise) or other claims for consequential compensation.
Over times doors will settle and may require occasional adjustment to ensure the correct operation. This will remain the responsibility of the customer and will be excluded from the warranty,
Glass units are fitted in accordance to GGF datasheet 4.1. Visual effects on the glass will only be replaced if they fail to meet these criteria.
Large units over 2.5m2 are subject to lower visual grading due to their size.
Units will only be replaced if they show condensation inside the unit. Condensation on the external face may occur on high performance units. Condensation may occur on the inside due to poor ventilation.
Fitting costs associated with replacement of Low sight-line Heritage or Histoglass type units, as used in listed buildings.

6. Carriage
Any additional packaging, carriage and insurance charges in respect of delivery of the goods to the customer will be charged to the customer..

7. Risk and Title
Risk shall pass to the customer so that the customer is responsible for all loss, damage or deterioration to the goods at the time when goods either leave the Company premises if being collected, or when arriving on site if the Company delivers. Title in the goods or any part there of shall pass to the customer when payment in full has been made or when the Company serves written notice upon the customer specifying that the title in Goods has passed. The customer shall permit and assist any officer, employee, representative or agent of the Company to repossess any unpaid goods.

8. Force Majeure
The Company shall not be liable to the customer, or be deemed to be in breach of any contract with the customer by reason of any delay in performing, or any failure to perform, any of the Company's obligations in relation to the goods, if the delay or failure was due to force majeure or to any other cause beyond the Company's reasonable control.

9. Insolvency of customer
If the customer, being a body corporate, shall pass a resolution or suffer an order of the Court to be made for winding-up, or if a receiver, administrator or administrative receiver shall be appointed or, being an individual or partnership, shall suspend payment, propose or enter into any composition or arrangement with his or their creditors, or have a bankruptcy order made against him or them, then the Company shall have the right, without predjudice to any other contract with the customer, not to proceed further with the contract, and shall be entitled to charge for work already carried out (whether completed or not) and for goods and materials already purchased for the customer, such charge to be an immediate debt due from the customer.

10. Applicable Law
These conditions shall be governed by and construed in accordance with Scottish Law and the parties acknowledge and accept the exclusive jurisdiction of the Scottish Courts.

11. Conditions Applicable
These conditions shall apply to all contracts for the sale of goods by the Company to a customer to the exclusion of all other terms and conditions which a customer may purport to apply under any purchase order, confirmation of order or similar document and all orders for goods shall be deemed to be an offer by the customer to purchase goods subject to these conditions.