Once Weathered Return Corner Coping Stones – Internal (Single Pitch)

ONCE WEATHERED RETURN CORNER COPING STONES - INTERNAL (SINGLE PITCH)

We supply high quality, Single Pitch (Once Weathered) Return Corner (Internal) Coping Stones to the domestic and construction sectors. Our coping stones are available in a range of sizes – perfect for your requirements, and delivered to your door with no fuss or hassle. See the datasheet for full information.

Our coping stones are designed with a single slope to allow water run off in one direction. Drip Grooves (where applicable) are installed on both edges to channel rainfall away from brickwork. On smaller coping stones that do not have drip groves, these can be added by special request.

Manufactured from high strength concrete with a smooth finish, available in Portland Grey.

PLEASE NOTE - Variation in both size and colour may occur during the curing process.

All our wall coping stones are Portland grey wet cast concrete using high strength cement CEM I 52.5N pure grade cement, packaged with care. Small packaging blocks are placed between each coping, along with a cardboard outer sleeve with waterproof cover. This means the customer receives their order in the best possible condition.

All wall copings should be cast using CEM1 52.5N, to meet the requirements to keep your wall cavity dry. Some companies may offer a thinner, cheaper porous coping (using a lower grade cement) which can often result in water ingress creeping into cavities.

DIY coping stone installation tips for those constructing a parapet cavity wall:

1. Mortar mix ratio 3 building sand : 1 cement using a plasticizer. The plasticizer's job is to reduce the water you add to the mix, which in turn helps reduce possible shrinkage of the mortar joints during curing.
2. Try not to lay copings on a very hot day, as this can dry the mortar too fast.
3. Always dampen the top of the wall along with the under side of each coping before laying your mortar, to maximise adhesion. A small amount of PVA bond can be added to improve adhesion and also tensile/flexural strength of the cured concrete.
4. If laying down on a parapet cavity wall, bridge the cavity DPC with a hi-load damp proof course. There are two types of D.P.C - one plastic, and one bitumen. The hi-load bitumen style is better at gripping your mortar, and helps to anchor down the copings your laying. The bitumen DPC's job is to direct any water that was to ever get past the coping over years to come. Out of the wall, preventing moisture damage to the inner leaf, and prevent the full fill insulation becoming saturated. Look at it as a secondary barrier!
5. When laying your hi-load DPC bed out your mortar along the wall approximately 8mm thick on both brick and brick or block & brick lay down your DPC. Run your trowel flat over the DPC, pushing down tight, and trim any over hanging excess DPC 20mm shorter than the width of the wall. Then centralise the hi-load DPC on the wall - the mortar between the DPC left and right will connect. creating a good contact. Repeat bedding out your mortar on the top of the hi-load DPC, and position your copings. (You have trapped the hi-load DPC between the two layers of mortar, but allowed the mortar between the DPC to connect on the edges (10mm each side). This helps the copings tp never slip on the DPC if copings are accidently pushed side on).
6. Always fill the perps / joints fully between each coping stone, try not to butt up too tight or allow mortar to dry too quickly.
7. You will notice on our images we are showing cavity closure products (Which we don't currently sell) and a detailed section of a parapet wall showing cavity tray positioning. The reason for the flat cavity closure that sits under the coping stone, is it helps prevent thermal bridging. It also reduces condensation / mould, meets fire safety regulations and improves energy efficiency.