Dresser is the market leaders in water based timber coatings. During 2014 we installed a new spray line with drying facilities. We have invested in the latest automatic spray line to complement our existing vacuum line.
Dresser, work with all the leading paint manufacturers including, Akzo Nobel, Morrell’s, Teknos, Sansin & Drywood. We offer both internal & external finishes in lacquers, stains & primes offering full factory finishes including end seal & secure packaging for all external & internal systems. Dresser offer full technical support & publish a number of guide documents along with technical specifications from all leading paint suppliers.
All finishes provided are all from water based paints & Lacquers only.
When applying external paint finishes for external uses it should be recognised that the long term performance of the timber cladding & the factory applied coating system can be very much influenced by a number of design details and manufacturing practices.
Coating project carried out on major build in the London area using Thermowood profiled cladding coated with a full factory finish coated with a Sikkens 3 coat application
- Consideration should be given to selected modified, laminated or finger jointed sections; this would enable the control of natural defects.
- It should be noted that the presence of knots, splits and shakes in timber, prior to coating, will lead to an adverse effect on the performance of the applied coating system. Once applied, a coating system can reduce the likelihood of further similar timber defects developing but should not be expected to provide a guarantee against this.
- A coating system should not be expected to protect from the effects of resin exudation of discolouration from water soluble extractives.
- The use of fast growing sapwood should be avoided at all times.
The level of exposure that a cladding wall receives can be greatly reduced by incorporating some natural protection into the design of the surrounding building.
The following design features will maximise the durability of the coated cladding sections.
- Designing a large roof overhang.
- Recessing cladded sections into the brickwork.
- Limited cladding to a maximum on elevations and locations exposed to severe direct weathering.
Within the timber coatings industry it is generally recognised that sharp edges and areas where water can pool can create serious limitations to the long term performance of the coating system and to the timber used for the cladding itself.
- All external edges are to be machined to a minimum 3mm radius rounding to all exposed surfaces. Unexposed exterior or interior surfaces should achieve a minimum rounding of 1.5mm radius.
- All joints should be fully sealed and protected from moisture ingress, particularly through end grain.
- A minimum slope of 15 degrees is recommended to ensure good water run off from horizontal surfaces.
- The profile should be designed to shed water over and away from the underlying boards. Suitably profiled capping and or cover strips may aid this process.
- All fixings should be concealed, protected and sealed by the use of clips, caps, fillers or the coating system itself.
- Intersections and junctions between boards which allow the passage of moisture through a capillary action should be avoided.
Preservative pre-treatment/coating system
- Factory finished coating systems must be applied in strict accordance with the requirements of the coating company data requirements.
- Ensure all tongue and grooves are fully coated with a full coating system.
- End sealer should be applied to full coating systems.
- It is strongly recommended that at least the base or primer be applied by saturation to ensure flow into all areas of the timber surface.
- All coats should be thoroughly dried before over coating is attempted.
- All cladding is to be installed and soundly fixed in accordance with the supplies instructions, avoiding any damage to the cladding and its coating system.
- It is recommended that good air flow and ventilation be achieved at the rear of the boards by allowing a minimum of 40mm gap from the supporting wall.
- A ventilation gap should be designed at the top and the base of the cladding wall.
- It is recommended that the appropriate damp proof membrane is used where applicable.
- It is recommended that cladding sections are placed a minimum of 200mm from the damp course of the building.
- All cut ends, including hidden joints, should be resealed with the full system including end grain sealer.
- Consideration should be given to the environment and conditions that the recently coated cladding boards are subjected to. Adverse weather conditions, especially heavy rainfall and frost, may have a detrimental effect on the freshly applied coating system and the cladding boards themselves, particularly prior to fixing.
- Care must be taken to avoid any handling/transit/storage damage, we strongly advise the use of protective wrapping on all cladding items, cover strips and trims; this is to remain undamaged until fixing begins.
- Boards should be stacked in a way to minimise the weight placed upon them and to maximise the air flow between stacked boards. The use of carefully placed spacers should not be placed together.
- All components must be stored under cover, preferably inside ventilated building. In the event of outside storage they must be kept clear of the ground on level bearers and protected against dampness and direct sunlight by a tarpaulin or suitable protective cover. There must be space for air circulation around and between components.
Care and maintenance of cladding after installation:
- Ensure all damage during transit or installation is repaired.
- Ensure all surfaces are cleaned and free from installation or building debris.
- The application of a cleaning and maintenance treatment is recommended (contact us for further details)
- Expected durability periods of factory applied cladding coatings will vary and are dependent on the level of weathering the cladding is exposed to, the type of coating used, building and design of the cladding and the surrounding building.
(NEW) Fire retardant treatments:
Dresser Mouldings are able to offer water based stains applied to Nom Com fire retardant treatments.
We are an approved coater for paint stains applications applied to Non Com fire treated timbers in association with Lonza treatments and Drywood coatings.
To help make the most of your cladding dresser are able to offer tried, tested and approved coated solutions to timber using water based stains provided by Drywood. All coating applications have been approved by both Lonza and Drywood.
Fire Retardant Protection:
UK Building Regulations will sometimes require fire retardant protection for timber claddings. To achieve the very best results in terms of assured performance and on-going maintenance we recommend Lonza industrially applied fire retardant impregnation treatments. These one-off treatments give timber cladding a high quality, maintenance free, Building Regulation compliant fire protection.
From our experience of supplying fire retardant treated timber cladding we recommend the following recommendation to help minimise any distortion of components during treatment and kiln drying.
- Always consider material selection from original sawn boards.
- Avoid large tongue and grooved profiles
- Always use only kiln dried material
- Never use profiles wider than 150mm nominal
- Avoid unsound knots when considering timber selection
- Avoid extreme profiling to prevent distortion of material.
Manufacturing of any timbers required for fire treatment, Dresser will liaise with Lonz treatments regards any non Com fire treatment request, on completion goods are returned to Dresser for completion of coating by applying oil based waterborne low film build stain in either translucent or opaque paint system.
Together with DRYWOOD, Dresser Mouldings can now offer DRYWOOD WOODSTAIN an high performance factory applied water based coating system with a 4 year warranty on either translucent, semi opaque and opaque finishes.
- A proven combination of oil modified waterborne binders DRYWOOD WOODSTAIN is low film build, high performance, water based coating system, providing superb protection against UV degradation.
- Available in a range of translucent, semi opaque and opaque finishes in both spray applied and vacuum coated application.
- Penetrates into the wood with excellent adhesion, building a thin layer in two or more coats. The thin layer allows the timber to breathe and prevents excessive dirt retention on the coating surface.
- DRYWOOD WOODSTAIN coated with NON COM Exterior treated timber delivers either EUROCLASS B or C fire performance as required.
- Clear documental procedures recording all coatings will be recorded and batch samples made available for the customer with master copy kept by Dresser.
- Coated and packed in line with DRYWOOD WOODSTAIN laid application procedures including end sealing of coated materials,
- Good practice guide to storage with clear labelling of coated products.
- Registration of the project with DRYWOOD COATINGS with clear documentation to support the use of an approved applicator (Dresser Mouldings)
Dresser Mouldings offers two proven and assured fire retardant treatments that meet the very latest industry standards- DRICON and NON-COM Exterior- to achieve either Euro class B or C in line with BS EN 13501-1 (Fire Classification on construction Products and building elements) – These new Euroclasses replace the old class 0 (BS 476 Part 6 & 7) and class 1 (BS 476 Part 7)