Q. What is Newton 805 Newlath?
Q. What size are the rolls of Newton 805 Newlath?
A. Two sizes either 1.5m x 10m covering 15 m2 of wall or 2m x 20m covering 40m2 of wall.
Q. How is Newton 805 Newlath fixed to the wall?
A. Use Newton 800 Mesh plugs (250 plugs per bag) with a 7mm drill bit drill through the membrane. Fill the hole with Newton Mastic, then using a club hammer, hammer the fixing into the substrate (protective goggles must be worn). Fixing centres vary depending upon the condition of the substrate, but as a rule of thumb fix between 250mm and 300mm centres vertically and horizontally.
Q. How many fixings do I need per roll? How many tubes of Newton Mastic do I need per roll?
A. As a guideline we recommend 1 bag of Newlath fixings per 15m2 roll and 3 bags per 40m2 roll.
Note: These guidelines are based on a professional installer fixing the material onto an even brick substrate (Number of fixings may vary indiffering substrates).You will require 4 x tubes of Newton Mastic per 15m2 roll and 12 tubes per 40m2 roll.
Q. Can Newton 805 Newlath be used internally and externally?
Q. I have tried to fix the Newton 805 Newlath with the traditional Newton 800 Mesh fixing plugs, but the substrate is poor and I am having difficulties. Do you have an alternative fixing plug?
- A. Random stone walls, Cob walls etc. are uneven and may require a longer fixing. Use Newton Cob fixings (90mm long) with Newton Mastic and proceed as with normal fixing plugs.
Note: Random and uneven walls should be dubbed out with a tight render coat prior to the application of the material. Do not attempt to level the walls on top of the Newton 805 Newlath as differential thickness of the material may result in cracking of the finish due to the render/plaster drying out unevenly.
Q. I have applied Newton 805 Newlath how do I fix shelving units, pictures etc?
A. You can fix through the material back into the original substrate by drilling through the material, apply a rawl plug and fill the hole liberally with Newton Mastic (preventing salts and moisture bridging through) and then proceed with the fixing of the units.
Q. How do I deal with the electrics?
Newton Mastic is applied to the plug before fixing into the membraneA. 1.Chase into the substrate, run the wiring through the chase (the wires must be protected from dampness) and bring electrics box through the material and seal around the edge with the Newton Mastic. A DPM must encase the back of the box to prevent dampness from bridging through.
2. Conduits can be surface mounted with an adhesive such as Liquid Nails.
Q. Do I have to hack off the plaster/render prior to installing?
A. If the plaster/render is solid and shows no signs of blowing then the Newton 805 Newlath can be installed over the top. If the original finish is friable, it should be removed up to 1.2min height from the floor. The Newton 805 Newlath is applied to the substrate (If in doubt contact Newtons on 020 7237 1217).
Q. How many coats of render/plaster do I need?
A. In normal circumstance 2 x 6mm coats and a 3mm skim coat are sufficient.
Note: It is essential to allow for sufficient dry time between coats. Refer to the finish specifications in the Newton 805 Newlath fixing instructions prior to application.
Q. If I use Newton 805 Newlath do I need an injected damp proof course?
A. No.
Q. My building is a listed structure can I use Newton 805 Newlath?
A. Most definitely. Unlike cementitious alternatives, Newton 805 Newlath is removable and has been successfully used on Grade I and II listed buildings since the early 1980′s.
Q. Can I use Newton 805 Newlath on a timber frame building?
A. Yes. Newton 805 Newlath is perfect for this application. High grade ply is attached to the frame and the Newlath is attached with galvanized clout nails at 100mm centres prior to the finish being applied.
Q. Once I have installed Newton 805 Newlath how long can I leave it before I apply a finish?
Newton damp proof membranes can be installed by a builder or competent DIY
A. Externally, we advise that you put a finish on the product no less than 4 weeks after installation as the mesh is not UV stabilised. Internally there are no issues.
Q. Can I use Newton damp proofing membranes in a below ground (earth retaining situation)?
A. No. Newton 805 Newlath is suitable for dealing with all forms of damp conditions above the ground but the fixing plugs do not deal with the potential of running water, and the system has only been independently tested by the BBA for damp-proofing. For retaining structures use Newton System 500 with suitable drainage.
Q. How long is the product warranty valid for?
A. Newton 805 Newlath holds a 30 year warranty and has been aged tested to circa 50 years.
Q. Can I install Newton 805 Newlath?
A. Yes. Newton 805 Newlath comes with detailed fixing instructions and can be installed by a skilled builder. If in any doubt John Newton can recommend Newton Registered Installers who are highly experienced at fitting the material quickly, and thus cost effectively.
Q. Does the wall membrane need to be ventilated?
A. You can provide ventilation behind the membrane by extending it into a floor or ceiling void or by simply leaving a gap at the top and or bottom of the membrane or by using our profile strip however we do not now put great emphasis on achieving ventilation behind our damp proofing membranes for the following reasons:
- Warm air from the internal space can travel into the void between the membrane and the wall where air is generally colder. When the warm air meets the cold air dew point can be reached which means that condensation can occur. This could obviously exacerbate damp problems or even present itself at the wall/floor junction.
- In addition our membranes use positive vapour pressure to ‘push’ dampness out of the property. Internal vapour pressure is greater than external vapour pressure. The internal pressure moves out to the lower pressure externally to try to equalise. In doing so, any dampness in the air gap between the external wall and the membrane is moved out of the property also.
Further Information
For further information or to place an order contact Newtons on 020 7237 1217.
