THE SOLID WOOD FLOORING COMPANY
E720 Light Fumed Engineered OAK Plank K21 Wood strip / board / board fine flooring / linings NBS Specification produced for: Brown and Carroll PROJECT: Rathbone Floor Type: Expresso Dark Colour
Prepared by: MR 4/21/2016
FLOOR TYPE E720 Engineered Timber Floor on Danskin Cradle system installed fully bonded to BS8201:2011 Code of practice for installing wood flooring.
THE SOLID WOOD FLOORING COMPANY
E720 Fumed Oak UV Oil Finish
NBS K21 / Substrate
NBS K21 / Wood Flooring NBS K21 / Storage
NBS K21 / Acclimatisation NBS K21 / Fitting
NBS K21 / Protection NBS K21 / Other Requirements
NBS K21 / Product Performance Requirements NBS / K21 Sustainability
NBS K21 / Responsibilities
NBS K21 / Under floor heating fitting guide
NBS specification for fitting Engineered Wood Flooring K21 Wood strip / board / board fine flooring / linings
To be read with Preliminaries/General conditions. WOOD FLOORING TO RESIDENTIAL UNITS: Project Rathbone FULLY BONDED TO P5 CHIPBOARD ON AN ACOUSTIC CRADLE & BATTEN SYSTEM
Danskin Acoustic Cradle System
Clean, dry firmly secured, smooth, even, and free from abrupt changes in level.
Above the substrate when tested with a hygrometer to BS 8201, Appendix A At the time of installation and at all subsequent times the RH within the rooms and areas into which the flooring is installed must remain within the upper/lower range of 30% - 65%. It is the responsibility of the Main Contractor (during construction phase), Building Manager or Occupier (post construction) to ensure that the RH does not deviate beyond these upper/lower limits. Ideally the environment within the rooms and areas where flooring is to be installed will be actively and dynamically managed by an intelligent BMS system to maintain the RH within the acceptable range.
Prior to installation and laying, the moisture content of the substrate is to be checked, in the case of the Danskin acoustic system the substrate is typically a P5 chipboard and hence the moisture content must be in the range of 6% to 9% when tested with a Hygrometer as described in BS8201:2011. If the results are outside these parameters, then installation should not take place as there is a potential that the adhesive bond may subsequently fail due to the differential movement between the P5 chipboard and the flooring. If the RH is maintained within the acceptable limits stated above, then the moisture content of the P5 chipboard will remain within acceptable limits. However, the risk of flood or similar inundation cannot be entirely ruled out, hence if such a situation occurs, then the chipboard must be adequately dried or replaced before flooring can be bonded to it.
All corners, around perimeter, and random points over area being tested.
Turned off for not less than 4 days before testing. If dehumidifiers are used then no wood flooring should be on site during this time.
Smooth, even, and free from abrupt changes in level. Apply suitable smoothing compound, as necessary.
The surface regularity when checked with a 3 m straightedge with 3 mm feet at each end, placed anywhere on the surface, will achieve SR2 to BS8204 and have no gap greater than 6 mm, and straightedge will not be obstructed by the substrate.
Subfloor Build Up:
Danskin cradle and batten acoustic floor system). The 18mm thick P5 T&G chipboard forms an enclosed floor void, into which a LTHW ‘wet pipe’ underfloor heating system is installed. Below this is a structural concrete slab, approx. 50mm rigid foam insulation, LTHW UFH pipes fixed to the top of the insulation, circa 50mm air gap.
We always recommend that a site visit is arranged prior to delivery and installation of any wood flooring. TSWFC Technical Director along with a senior representative from Sika will visit the site and inspect all aspects of the subfloor and environmental conditions and will produce a report having tested both humidity and moisture level. Advice will be given on when the wood flooring should be delivered, acclimatised if necessary and then when fitting should start. This is specialist free of charge (in the UK) service to ensure conditions are right.
WOOD FLOORING: Free from decay, through splits and insect attack (including ambrosia beetle damage, unless permitted in the class/ grade specified). Manufacturer:
The Solid Wood Flooring Company - Tel: 01666 504015 Email: [email protected]
E720 – Engineered Fumed Oak Flooring Plank.
Oak FSC 100%
Class / Grade: To BS EN 942, AB Grade with sound knots up to 10mm permitted.
20mm thick x 280mm wide x 2200 long with a 4mm top layer.
Long edges: 1.5mm bevelled tongued & grooved, Ends: Square
Light fumed and then finished with a UV Oil
Solid Oak - 4mm cut veneer adhered to a multi ply backing with Dynea wood adhesives designed for use with under floor heating
The moisture content of the wood flooring boards should be maintained at between 6% and 9% Manufactured boards cured and kiln dried to balance the moisture content of all components.
Adhesives used in the manufacture of Solid Wood Flooring boards are supplied by Dynea.
When tested to EN 717 – part 1 the release of formaldehyde in wood flooring construction materials must have a formaldehyde content of less than 3 parts per million. Solid Wood Flooring boards tested to EN 717: part 1 achieve results of 0.014 mg / m3 which converts to 0.0053 parts per million.
STORAGE: The wood flooring boards are to be stored in conditions where no moisture can attack them. It is important that all wet trades have been completed before any boards are received on site. Storage conditions should have a Relative Humidity of less than 30% and more than 65%.
ACCLIMATISATION: Where the boards are to be fitted over under floor heating the heating must be commissioned and fully operational before the wood flooring is delivered to site. It should then be left to acclimatise in the general location of the room/areas where it is to be laid for at least 14 days before they are fitted. Concurrently the underfloor heating should be operating at normal temperatures to precondition the chipboard subfloor. The cartons: Must be stacked a minimum of 50mm off any floor Must be stacked a minimum of 500mm from any wall. Must be fully supported along their lengths, Should be opened at each end to assist acclimatisation.
FITTING: Flooring to be laid fully bonded and to be fitted in accordance with BS 8201:2011 - Code of Practice for Flooring of Timber, Timber Products and wood based panel products. The guide to fitting Parquet floors should be used to ensure “Crown” lines are accurately set out to guarantee a professional installation. Moisture:
Moisture content of the boards at the time of laying is to be 6-9%.
Method of finishing:
Prefinished boards with builders clean.
The Engineered boards are to be laid fully bonded using SW890 adhesive The adhesive to be applied with a 6mm notched trowel to provide a solid bed of adhesive between the base of each board and the substrate
The wood flooring fitter will be responsible for ensuring that the site conditions comply with BS8201:2011. The wood flooring fitter is responsible for using the wood boards to create a finished floor that complies with good working practice and generally in accordance with BS8201:2011. It is recommended that a representative area of flooring is loose laid to demonstrate the range and variation of colour and grain to the Architect/Main Contractor as a benchmark prior to undertaking full scale installation. The wood flooring fitter is responsible for checking that every board is of the desired quality and suitable for use before, during and after fitting and if there is any doubt, boards should not be fitted.
On completion of fitting the surface of the boards should be vacuumed to remove any particles of wood or sawdust, ensuring that no residues from any of the fitting and other trades remains attached to the surface of the boards. The fitter should clean the boards with the recommended cleaner and ensure that the Main Contractor, Building Manager and Occupiers understand how the wood flooring should be cleaned and maintained. The Solid Wood Flooring Company will provide a cleaning and maintenance manual to give to each Occupier to ensure that they know how to clean and maintain the wood floor.
PROTECTION Protective covering:
Submit proposals - Remove at completion Should the installed wood floor need protection from other trades, then the boards should be covered with a 1.5mm to 2mm breathable layer and then hardboard/MDF with all joints taped. Any under floor heating should be fully commissioned and working correctly before the floor is laid but it should be switched off during installation and should not be turned on until the protection has been removed NEVER cover the floor with any impervious materials which could cause the boards to sweat and affect the structure of the boards NEVER create potential ‘Hot Spot’s’ by placing any thick or rubber backed rug’s on the finished floor which could cause a heat build-up and damage the structure of the boards.
OTHER REQUIREMENTS: Expansion:
PERIMETER – A minimum 10mm expansion gap is required around the perimeter of the floor and/or where the wood flooring meets differing materials. LONG ROOMS - Should the floor dimensions exceed 8 linear metres in any one direction, then extra provision should be made for expansion and expansion gaps of up to 8mm should be designed into the floor. DAY WORK JOINTS - Day work joints are not appropriate in this instance, but can be bridged if necessary CONSTRUCTION JOINTS - Any construction joints that run across the floor must not be bridged and expansion joints should be installed at these points and designed to follow the line of the construction joint.
It is the art of the fitter to ensure that fitting is conducted to achieve an acceptable blend of shade variation, colour and knotting which are all inherent characteristics of any natural wood product
As designed into the floor
PRODUCT PERFORMANCE REQUIREMENTS: ENVIRONMENT:
For wood flooring to retain its integrity its moisture content must remain at around 8%. Humidity controls in hermetically sealed buildings must control the Relative humidity between 30% to 65% (maximum). Managing relative humidity and moisture levels, can prove to be difficult for a professionally qualified engineer and this becomes increasingly difficult for end users particularly with the changes in seasonal conditions. Refrigerated air conditioning will dry the air below 30% and it is crucial that any airconditioning units have moisture controls and humidifiers.
Load bearing: Reaction to fire: Slip Resistance:
Conform to BS 6399-1: 1966 table 1 section 3 Perform to EN 13501-1 Dn s1 Tested to BS 7967-2: 2002 (Pendulum Test)
LOW 36+PTV’s MODERATE 25 – 35 PTV’s HIGH 0 – 24 PTV’s
EN ISO 10456 and EN ISO 12664 Result 0.15 W/(mk)
DRY (61) LOW RISK WET (29) MODERATE RISK
Release of Formaldehyde Tested to EN 717 – 1 Result 0.014 mg / m3 Requirement: Less than 3 ppm Result: 0.0053 ppm Moisture Content Thermal Conductivity EN ISO 12664
EN 13183 - 1 EN ISO 10456 Result 0.15 W / (mk)
6% to 9%