V4 - Sealing of cracks in wood

    Cracks (max 0.5 cm wide and 05 cm deep)
  1. Remove the paint system around the damaged area.
  2. Check the wood moisture content level. If over 18%, let the wood dry.
  3. Drill a hole on both ends of the crack to avoid further cracking of the wood.
  4. Clean the crack thoroughly with a cutter to create an opening of min.1 cm wide and 1 cm deep. Remove dust and loose fibers.
  5. Apply a thin layer of Renofix primer in the crack and let it penetrate for at least 20 minutes and up to a maximum of 2 hours.
  6. First apply a thin layer of Renoflex repair paste and than fill entirely. Avoid air pockets.
  7. After curing, sand. Preferably mechanically.
Risk: In particular sills with finger joints and/or laminated parts are very prone to damage and require extra protection to prevent decay.
Neuslatten
    Applying wooden ledges
  1. Remove all existing beads or glazing profiles.
  2. Clean the sills and check the substrate for wood decay and open joints. If necessary, do repair work.
  3. Check the wood moisture content level. If over 18%, let the wood dry.
  4. Sand the sills. Apply two layers of a base coat to all bare wood spots, followed by a top coat ensuring sufficient technical protection.
  5. Place the ledge. (use ledges and beads made of FSC hard wood, preferably meranti (volume mass> 500 kg/m3)). Use wood without any finger joints.
  6. The ledge should extent at least 5 mm over the edge of the sill thus creating a ventilation space of at least 5 mm.
  7. When fitting the ledge, make sure a seam of at least 4 mm is created on each side of the ledge.
  8. Seal this space when sealing the glazing system.
  9. After shortening the profiles, sand the ends well and apply two layers of base coat.
  10. For optimal protection, use Renobond glue and end grain sealer in stead of the base coat.
  11. The joint with the vertical beads should be cut with a saw or sharp chisel in a 45º angle.
  12. Sand the bottom edges of the vertical beads well and apply two layers of base coat or, for an optimal sealing, a layer of Renobond glue and end grain sealer).
  13. The joint between the vertical bead and the top of the ledge should have a tolerance of no more than 4 mm. Place the ledge on black blocks with a thickness of 5 mm.
  14. Place the blocks with a compound near the screws lengthwise in the rebate to ensure that the ledge cannot tilt. Or place the blocks under the ledge with the same screws that fasten the ledge to the sill.
  15. Fasten the ledge with stainless steel bulb screws to avoid damage to the wood. Always drill a guiding hole before placing the screws. Use screws every 20 cm and not further then 6 cm from the corners.
  16. Preferably use an elastic sealant for the sealing of the glazing system. E.g. Renotop. The sealant strip should be at least 5 mm wide and 6 mm deep.
  17. Make sure all surfaces are clean (dust, dirt and grease free) and dry when applying the sealant. Do not use in temperatures below 0º C.
  18. Apply the sealant in a water shedding angle of at least 15º.
  19. Finish with a paint system of your choice.
    Remark: Damage (often cracks) in wood with finger joints and/or laminated wood.
  • With this type of substrate it is very hard to achieve a durable repair an no warranty can be given. Technically the best option is to apply a ventilating wooden ledge. (See below). If that is not possible, one can consider the use of polyester cloth to protect the sill.
  • Repair cracks (max 0.5 cm wide and 0.5 cm deep) as described under V4.
  • Round sharp edges of the sill to a radius of at least 5 mm.
  • Apply a layer of Renofix Oranje on the horizontal part of the affected sill.
  • Press the cloth in the still wet layer of Renofix Oranje. It is very important to remove any air pockets with a spatula or roller.
  • Immediately apply a new layer of Renofix Oranje over the cloth (wet in wet).
  • Sand the Renofix Oranje after curing. Make sure not to damage the fibres of the cloth.
  • Finish with a paint system of your choice.
Glasvlies1    Glasvlies2

Glasvlies3    Glasvlies4

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