Larsen Streetscape FJM

Technical information

Size	25kg multi-walled paper bags
Coverage	13.6L per 25kg or approximately 7-10 square mtrs per 25kg bag
Compressive strength	>40MPa
Joint widths	Suitable for 5mm–50mm
Joint depths	Up to 200mm

How do I prepare for using Larsen FJM?

All joints to be grouted should be clean, free from grease, oils, dust and loose particles or any debris that may interfere with the adhesion. It is important to thoroughly saturate the paving, joints and bedding before grouting using plenty of clean water ensuring no standing water or puddles are left on the paved area or patio. Saturating the whole area will ensure that the grout comes off the paving slabs easily, but remains in the joints, this is incredibly important with highly textured or absorbent paving.

How do I mix Larsen FJM?

In a suitable container or bucket, mix 5 litres of water per 25KG bag, mix with a suitable mechanical mixer for a minimum of 3 minutes to produce fluid, batter type consistency. Where necessary a little less water can be added to produced a slightly thicker mortar for patio's and paving which have a fall built in. Please note that if you use additional water to make the product more flowable, the strength of the product will be reduced, and the product may settle or bleed. Do not re-wet or add additional water and re-mix grout which has started to 'go off'.

How do I apply Larsen FJM?

Streetscape FJM can be applied in joint widths of 5-50mm, and up to 200mm deep in one single pass. Do to its fluid nature it is important to ensure that none of the grout escapes into nearby drains or water courses. Once mixed, Streetscape FJM can be applied either with a watering can into joints, or flowed over the entire area and squeegeed into joints. Care must be taken to keep the area moist at all times with a spray of water, never allow it to dry during the cleaning process, allow the fast set jointing mortar to firm up before attempting to clean the paving slabs.

How do I clean and wash off Larsen FJM?

Once the joints have firmed up spray the area with water, then using a squeegee or brush begin to work over the area taking care not to brush the material from the joints, keep wetting and cleaning the area until all of the mortar has been removed from the slabs, but remains in the joints. Ensure that you follow the instructions carefully on the bag, taking care to note the temperature - cold temperatures will mean the grout will remain softer for longer, high temperatures will mean the grout will go off faster. Once grouting of the joints is complete, protect the area from foot traffic for at least 1-2 hours, and vehicles for 4-6 hours.

What equipment will I need to mix, apply and wash-off Larsen FJM?

• Neoprene Squeegee for application: click here to purchase a squeegee
• A stiff bristle brush for stubborn/hard to reach areas
• Soft brush for cleaning off
• 110 paddle mixer
• Transformer
• Extension lead
• Large bucket
• Large measuring jug
• Rubber float
• Small trowel
• Jet washer | Hose | or Washboy
• Wellies
• Sponge for cleaning around edges
• Leaf blower for cleaning leaves or getting water out of joints
• All simple items in every contractor’s kit!

Follow these tips to avoid any stains or efflorescence when using Larsen FJM:

• Clean and dampen the paving joints and surfaces with water, remove any ponded water
• Keep the paved area damp with a light misting of water throughout the application
• Use a rubber squeegee to push the grout into the joints, and immediately remove any excess paving grout for the surface of pavers
• Once FJM has begun to set, use either a squeegee or a brush and a little water to agitate the remaining grout on the surface of the pavers and remove any hardened mortar
• After approx. 30 minutes of applying the grout (and once it has fully hardened, do the thumb test), clean the surfaces thoroughly to remove any spots and prevent staining
• To avoid causes cracks and low spots when using Larsen FJM, don't clean your slabs off too early! Do the thumb test, if your joint is still slightly soft to the touch, it's too early, wait and hold your nerve. This is especially important during colder weather, you'll just wash half the material away out of your joints