FAQs

Installation Guidelines for Multi-Layer Flooring over Under floor Heating

General Advice and Recommendations (Hot Water Pipe Systems)

The radiant heating system must not exceed 8 watts/sq. ft. heating capacity and the running water temperature should range between 38 - 48⁰C.

The Sub floor temperature should not exceed 27⁰C.

To preserve the integrity of the multi layer hardwood flooring the room temperature must not vary more than 10⁰C between seasons, and the humidity must be maintained between 40 and 65% relative humidity throughout the year.  A humidifier should be used to maintain relative humidity if necessary.

 Pre-Installation Requirements

Before installing the multi layer hardwood flooring, radiant heat slabs must be activated to normal living temperatures for a minimum of 21 days.  This will help to ensure that the slab is dry. However, the use of a hydro-metre is advised to determine the exact moisture percentage of the slab prior to proceeding with the installation.  During this period the temperature should be gradually increased until the maximum recommended temperature is reached.  The maximum temperature should be maintained for at least a week.

Heating pipes must be covered with 30mm of concrete or minimum 3mm below bottom side of plywood subfloor.  In addition, for plywood sub floor, heat transfer plates or insulation boards must be under pipes.

Prior to the installation date – approximately 3 days, switch the heating unit off following the manufacturer’s heating units guide lines, so that at the time of installation the subfloor temperature is between the recommended range of 18 - 20⁰C.

The installation can now be carried out.

After installation the temperature of 18 - 20⁰C should be maintained for 3 - 4 days before the heating unit is turned on, before increasing the temperature gradually over a further 3-4 days until the recommended surface temperature of 24 - 27⁰C is reached.  Despite the season this temperature should be maintained for a further 3 days.  

During the heating period small hairline cracks may appear.  These hairline cracks are generally evenly spread and are not cause for concern.  They may also eventually appear under rugs and furniture.

Note: that these are guide lines only – site conditions will vary - so the final instruction and advise must come from the person who will be fitting the floor.

Product: Rewmar MS Polymer Flexible wood flooring adhesive

 Rewmar MS Polymer is a water and solvent free MS Polymer based flexible wood flooring  adhesive. It can be used for mosaic, 20mm solid, stab, pre-finished and end grain parquet, wood-plank and wood-block as well as any exotic timbers and 15 or 20mm engineered hardwood flooring. It is suitable on porous and non-porous surfaces such as sand/cement screed, concrete, anhydrite, wood and chipboard. This product is water and solvent free and therefore there is minimal risk of wood deformation. In short, there is very little that you cannot stick with this superb high tech wood flooring adhesive.

Consumption: Approximately 1kg per m² (using a 6mm V notch trowel)

Subfloor: The subfloor must be flat, dry, clean, smooth, sound and free from cracks. Irregularities like old adhesive, stains etc may adversely affect the adhesion. Uneven surfaces must be leveled with a self leveling compound. Due to Rewmar’s universal application capabilities the adhesive is compatible with all proprietary leveling compounds, both latex and water based. Smooth surfaces like anhydrite should be roughened and if necessary the top layer should be removed. A preliminary compatibility test is recommended on every surface.

Application:

16 kg Tub.  Remove lid and protective plastic film. (Keep the film to recover the unused adhesive for storage).  The adhesive can be poured onto the substrate to be trowelled as needed. 

12 kg Bag.  Cut the corner off the bag and squeeze the adhesive onto the substrate for trowelling as required.

 Spread the adhesive directly to the subfloor with a 6mm V notch trowel. The 6mm V Notch is designed to apply sufficient adhesive to firmly bond 20mm wood plank flooring. A smaller notched trowel may be used if fixing smaller format wood flooring such as wood blocks or prefinished 14-15mm boards. Do not apply more to the surface than can be covered with flooring within 30 minutes. Lay in the flooring and tap into place. Ensure good adhesive transfer to the flooring (minimum 80% cover). Loading the floor with weights will improve the transfer. Allow a 10-15mm expansion gap between the wood flooring and any abutments such as walls, door frames etc. Wait at least 12 hours before sanding. Do not apply the adhesive at temperatures below 5°or above 25°C and at a relative humidity above 75%. Do NOT dilute the adhesive. Fresh adhesive can be removed by wiping with a damp cloth or with Rewmar Hand and Tool Wipes. Always remove excess adhesive as soon as possible as the process becomes more difficult the longer it is left and will in time require mechanical removal.  Always refer to the installation instructions from the flooring manufacturer and all applicable flooring  regulations and standards.

 Storage: Shelf life maximum 12 months in original, closed packaging. Store in dry conditions at 5-25°C.  Acclimatise cold product to come to room temperature before use.

A GUIDE TO ASSEMBLING OUR KIT DOORS

Before assembling the doors we recommend that you consider whether the door is inward or outward opening as this will affect the desired ledge length.

TO ASSEMBLE A LEDGED ONLY DOOR KIT

1. Lay out boards and press tongues and grooves together.
2.  Square up and check dimensions.
3.  Check ledge length
4.  Drill ledges: We suggest 2 holes per vertical board in each groove.
5.  Drill clearance hole in ledges so that screws don’t bind (suggest 5mm drill)
6.  If screwing by hand we would suggest a 2mm pilot hole is drilled in the door boards, this is not necessary if a powered screwdriver is being used.
7.  Ledges placed 7” from top and bottom of door.
8.  Position the 2 remaining ledges equally between the top/bottom ledges.  Drill holes in grooves on ledges as step 5.
9.  Place a small amount of glue in grooves then tap beading into grooves.  Trim the edges of the beading.

TO ASSEMBLE A LEDGED AND BRACED DOOR KIT

As above, but centralize third ledge.

1.  Cut braces to suit door hanging preference (see “Door Hanging Reference” sheet)
2.  Drill these pairs of holes top, centre, bottom of the brace using a 3/8” counter bore drill bit.
3.  After screwing braces onto door, use a small amount of glue and tap in plugs, trim and sand.