What are the distinctions between your various fibreglass roofing kit ranges?

We offer multiple fibreglass roofing kits, each catering to different needs:

– Trade Line: Good quality and budget-friendly design.

– SilverSeel: Excellent quality, fire-retardant (Domestic Grade), Lloyds approved, and       cost-effective for marine applications.

– Restec: High quality, fire-retardant (Domestic Grade), and LABC approved.

– Cromar Pro: High quality, well-known, and long-established.

– Metrodeck: Gold standard, fire-retardant (Commercial Grade).

Each kit range includes options for 450g kits (light foot traffic), 600g kits (heavy-duty foot traffic), and 2 x 450g layer kits (extra heavy-duty for walkways and balconies with metal furniture).

How much hardener/catalyst should be used in the fibreglass roofing kits?

RKD recognises that determining the right amount of hardener/catalyst is crucial in installing a fibreglass flat roof. Here are some guidelines:

– Thoroughly mix the catalyst into resin and topcoat in a pot or bucket (not in the tin).

– Use a proper catalyst dispenser for accurate measurement.

– Avoid using too much catalyst, as it can lead to curing failure, just like too little.

– Pot Life: Resin cures quicker if left in the bucket (about 20 mins), so mix little and often as you go.

– Curing time is affected by climatic conditions (temperature); hotter conditions result in faster curing. Consider direct sunlight exposure.

– There is no exact definition for catalyst-to-resin ratio; hence, mix little and often to adjust percentages based on temperature and local conditions.

– Resin and topcoat catalyst addition is the same; base layer and topcoat should cure in about 30-40 mins with the right mix.

For many kits, seasonal catalysts are provided:

– Fast + winter

– Standard = normal temps

– Slow = High summer

Is it possible to apply the topcoat layer of a fibreglass roof on a different day without compromising waterproofing?

Yes, it is indeed possible, but there are additional considerations to keep in mind. This question arises frequently, particularly from first-time customers and those dealing with larger roofs during the Autumn/Winter months when daylight is limited.

The straightforward answer is yes – with the resin/matting base coat layer correctly applied, your roof will be fully waterproof. However, there are a few important points to consider:

Moisture: Both the roof and the base coat must be dry before applying the topcoat, as moisture can hinder the curing process.

Topcoat Application: While the topcoat may seem like a simple colour finish when mixed with catalyst and applied like paint, it serves a crucial role. The topcoat enhances the structural integrity of the roof, chemically bonding to the base coat/resin layer, and provides UV damage prevention attributes.

Catalyst Ratios: The catalyst ratios for the topcoat are the same as those for the resin layer. However, conditions may differ on another day, so it’s essential to check charts and climatic conditions.

Timing: If you apply the topcoat on the same day or within approximately 12 hours, there’s no need to sand the laminate for bonding purposes. Beyond this timeframe, a light sanding and wiping down with acetone are necessary. Sanding provides a key, and acetone helps the topcoat chemically bond to the resin mat/base layer.

Additional Sanding: Many installers prefer to give a light sand to check for any bumps, smooth trim edges, etc. (cleaning off properly with acetone).

Safety Precautions: Always wear a mask, goggles, and gloves when applying topcoat or laminating. Have your tools ready and easily accessible. Use masking tape to mask off edges to in situ fascia boards, etc.

In summary, while it is possible to apply the topcoat on a different day, careful attention to moisture, timing, and proper preparation is crucial to maintaining the waterproofing integrity of the roof.

I’ve already installed 8 x 4 OSB3 plain boards, but you recommend using 18mm OSB3 Tongue and Groove deck. How can I address this?

It’s not uncommon for individuals to have already laid 8 x 4 OSB3 plain boards, and we understand the convenience of these sheets. While we recommend 18mm OSB3 Tongue and Groove (T&G) decks due to their natural expansion properties within edging joints, working with 8 x 4 sheeted decks is easily manageable.

Here’s how you can address it:

Expansion Considerations: Typically, T&G decks provide natural expansion properties within the edging joints. With 8 x 4 sheeting, expansion is managed by allowing a 3mm gap between sheets.

Fibreglass Bandaging: To ensure the full integrity of your fibreglass roof, you’ll need to address the gap by using fibreglass bandaging. Apply the bandage over the join and use catalysed resin. Let it settle, then paddle roll, similar to the process for the base coat layer. This bandaging serves not only to bridge the gap but also becomes an ideal test bed for catalyst addition.

Kit Inclusions:  All RKD fibreglass roofing kits come with increased quantities of resin and bandage to accommodate nominal wastage and edge trim sealing. If your roof exceeds 15m2 and you have an 8 x 4 deck, each kit provides an opportunity to purchase a little extra resin or bandage to address this requirement.

In summary, while the recommendation is for T&G decks, adapting to an 8 x 4 OSB3 plain board setup is feasible. The key is to address the expansion gap using fibreglass bandaging, ensuring the full integrity of your fibreglass roof. Our kits are designed to provide flexibility and options for additional materials if needed.

I need to purchase edge trims for my fibreglass roof. Which ones and what size should I choose?

GRP Fibreglass Trims are available in 3m lengths, and we also offer Half-length sizes for popular trims. Here’s a guide to help you select the right edge trims based on your roof type:

Small Roofs/Bay Roofs:

   – Depth: 65mm

   – Recommended Trims: A170 Drip and B230 Raised edge trims together

Standard Roofs (e.g., garage/extension):

   – Depth: 90mm

   – Recommended Trims: A200 Drip and B260 Raised edge trims together

Warm Roofs:

   – Depth: 140mm

   – Recommended Trims: A250 Drip and B300 Raised edge trims together

Preformed Corners (C1, C2, C4):

   – Compatible with all the above trims

For Adjoining Walls and Upstands:

   – Use D260 Wall fillet combined with a C100 flashing trim (most common solution)

When an Existing Chase from a Felt Roof is Evident:

   – Use D300 Wall fillet combined with a C150 flashing trim wall fillet

Flat Roof Adjoining a Tiled Roof:

   – Use F300/600/900 trims as needed

Remember that these recommendations are general guidelines. It’s crucial to assess your specific roofing situation and requirements. If you have any uncertainties or unique conditions, feel free to consult with our experts for personalised advice on edge trim selection.