WELCOME TO COCHRANE AND ASSOCIATES
CHRISTCHURCH BASED DRYWALL CONTRACTORS – SUPPLY, FIX AND STOP
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COCHRANE AND ASSOCIATES:
- Work around Canterbury to provide quality interior drywall and plastering services at competitive prices
- Are leaders in supplying, fixing and stopping Gypsum plasterboard and coving along with metal ceiling battens
- Are your one-stop shop for all GIB® and plastering needs
- Have a simple three-step process to ensure a successful job – from quote to completion
You can depend on Cochrane and Associates to provide excellent service and top-quality workmanship every time. Our team has many years of experience, knowledge and skill in plasterboard fixing and stopping industry.
WE ARE ENDORSED, CERTIFIED AND RELIABLE
- Club GIB® installer programme, which is committed to a high standard of workmanship throughout NZ. A limited number of selected installers make up a nationwide network of specialist drywall professionals and are provided with comprehensive training to ensure a high standard of fixing and finishing services.
- Endorsed by Winstones Wallboards in the Christchurch area.
- Association of Wall and Ceiling Industries of New Zealand (AWCI), the national association that represents members and customers for ceiling, wall and lining sheathing systems and related products. Architects and designers are increasingly specifying that drywall fixers and plasterers be part of this association.
COCHRANE AND ASSOCIATES 3 EASY STEPS
Step 1 – Keith Cochrane –
Step 2 – Tim Wealleans – measure, install and finish
Step 3 – Neville Jones –
Keith will discuss your requirements and explain the options, for example:
- supply fix and stop
- 13mm GIB® for ceilings
- Aqualine- GIB®
- GIB® -Cove
- square or round/bullnose corners
- supply and install of metal ceiling battens
Keith will price your plans, giving a detailed written quote. Note: this is a quote NOT an estimate. Everything is explained, with no hidden or surprise costs.
After the quote is accepted in writing, Tim will arrange a site-measure and give any advice on bracing requirements needed to get through the council’s pre-line inspection and identify any potential issues.
Tim will arrange delivery and hand unloading, fixing and arrange your Council pre-stop inspection if required before the stoppers arrive. GIB®-Cove will be installed, if this upgrade is chosen, before your builder returns to complete finishing ready for the painters to begin.
Neville will check your house and attend to any defects or damage to the plasterboard after the stoppers have left, walls, ceilings or cove, and ensure a comprehensive check.
Once the sealer coat has been applied we can return for a final check. As maintenance manager, he’ll work in with your painter and builder.
But our great service doesn’t finish there. We will come out and fix any popped nails or general movement issues that may occur during the settling period of your house.
LEVELS OF FINISH
Use our guide to the different levels of finish available when installing and stopping (plastering) plasterboard.
SHOULD YOU CHOOSE LEVEL 4 OR LEVEL 5 FINISH? WHAT IS THE DIFFERENCE?
- Key difference – with level 5 the entire surface is covered in a thin layer compound called a ‘skim coat’ to remove surface textures and porosity.
- Level 5 helps conceal joints and fix points with a more even texture. Stricter framing and installation requirements are needed to ensure a level 5 finish is achieved, A true Level 5 is more than just a skim coat.
- Consideration should be given to lighting design and layout as this can greatly affect any level of finish.
- Extra labour costs for level 5’s skim coating process can add approx $200-$250 to one 15msq wall.
LEVEL 4 PLASTERING FINISH – DETAILS AND TIPS
A Level 4 finish should be fine if all steps are taken. If in doubt, please ask for advice. We are more than happy to talk you through it.
If required specify Level 5 at the planning stage to ensure building tolerances are met in the sub-straight/framing.
Level 5 always requires the cooperation of the architects and designers, lighting design, builders and framers, plasterboard fixers and installers, and plasterers and painters to achieve a suitable standard of finish. Level 5 isn’t just a matter of a skim coat rather it’s a whole process. Some minor imperfections may still be visible in a level 5 finish.
You shouldn’t see a big difference in the surface texture between the smooth plaster finish and the paper faced board surface on a Level 4.
Plasterboard Level 4 shouldn’t show this texture difference if appropriate painting practices and procedures are follow correctly.
If this difference is seen after painting you’ll notice smooth joint bands of plaster under the paint. This is because the texture differences between smooth plaster and rougher paper surface can be seen. This needs to be disguised and camouflaged through painting. The “Orange Peel” affect helps to disguise and break up the light striking the surface.
Level 5 or one of the many high-build paint applied surface preps should achieve a good satisfactory finish.
Ensure your painter is trained in the use of their given method of application. A beautiful finish can be achieved if all steps are taken and considered.”
A Level 4 finish should be fine if all steps are taken. If in doubt, please ask.
HEALTH AND SAFETY
Cochrane and Associates is committed to meeting the obligation of the Health and Safety act.
We ensure as far as reasonably practicable that the health and safety of every person working on or visiting our workplace is safe.
A successful, high-quality plasterboard finish is dependent on excellent service, top-quality workmanship and knowledge… and the following few simple steps:
- Identify any potential issues with the sub-straight/framing
- Framing. Check it’s true and straight. It’s the builder’s responsibility to check that the sub-straight / framing be pre-straightened and ready for the plasterboard fixers to fix to.It’s especially important to check the external corner stud framing at the top & bottom. These studs often twist and over hang the top & bottom plates. A simple trick is to add a small timber off-cut between the corner studs. This can true up the corner and aid greatly for the skirtings to sit nicely once trimmed and plastered
- Identify any potential issues with the plans, ie not bracing is behind showers or baths, stairs and stirwells, if in doubt we can check for you
- Ensure bracing element lengths use the whole wall length for a clean finish
- GIB® HandiBrac hold-down brackets are recommended for GIB® BL & UP bracing systems and are required on EP bracing (Eco Ply), as these are quick and easy to fit at any stage before the pre-line inspection
- GIB® HandiBracs ensure framing face is clear from any protruding straps so flush and flat plasterboard lining allows skirting boards and tiles to sit true
- If bracing straps are used, these should be checked by the builder to allow GIB® linings to be fixed flat against framing
- Ensure the paint is full strength and applied as per manufactures specifications (especially important if spray applied) see next section on painting tips
- Consider your lighting design and raking light, ie some wall washing lighting can give an undesirable effect that a lighting designer or home owner may not have considered or be aware of. New style LED lighting can be very harsh so advice should be sort and diffusers used to soften these lights. Your wall / ceiling finishings will thank you for it
- Consider using Steel ceiling battens on clips for a truly flat ceiling while avoiding the assorted movement problem with possible timber movement and shrinkage that help cause screw popping and joint peaking issues. Metal battens on clips allow moment and have greatly reduced issues with ceilings since their introduction. Cochrane’s also install metal battens, so we can advise on there use and we highly recommend their use in ceilings
- Consider using Architrave door and window reveals over the Grooved jamb type (highly recommend for that superb finish)
- Ensure insulation (Fibreglass Batts etc) are touch fitted and any pipes or intrusions within wall cavities like wires and extra blocking have been cut around to avoid the insulation pushing & distorting the plasterboard. Also for every % insulation is compacted or squashed you’ll lose that same percentage in R-rating efficiency in the heat retenion and noise loss reduction efficiency is greatly reduced. Pre-line inspections may fail as a result as this should be inspected by the council inspection
- Ensure your electrical contractors have marked all their switch and plug boxes on the floor and all wiring is neatly tucked away within the walls/ceilings and any excess wires aren’t overly long in length
- Identify any ventilation issues, ensure some windows/doors can be opened to allow air movement while the plaster/paint dries. Humidity/moisture in the air needs to escape to the outside to assist in drying and avoiding issues associated with poor ventilation from masking films applied over windows/doors on the outside or inside when painting etc. Your house needs to breathe as much as we do with fresh air. If you’ve ever slept in a tent, you’ll relate. Don’t underestimate the damage and issues high humidity can cause to the finished product. We are happy to advise
- Please Note: Plasterboard Fixers/Installers aren’t Licenced Buildering Practitioners “LBPs” So therefore, this requires your LBP builder to still sign off any restricted building works. This is normally archived when your builder signs off as the main contractor whether there was a pre-stop/post-line inspection or not.
Painting of Plasterboards & Backrolling
The Master Painters Association recommends that when painting new plaster board a three coat system should apply as per
the Industry Standard.
The Master Painters Association recommends that when painting new plaster board a three coat system should apply as per the Industry Standard.
- The first coat should be applied with a 10mm wool nap roller
- If the first coat is to be applied by spray application then backrolling must occur whilst the paint film is still wet.
- The two finish coats should be applied as normal with backrolling when spray applications have been used.
- Two coat systems on raw plaster board do not allow the paint product used to reach its full potential both in performance and colour depth. If a two coat system is to be used we recommend a manufactures warranty be obtained.
- Touch ups on low sheen or satin finishes are not recommended and the whole area should be recoated to maximize the paint finish.
- If coverage has still not been achieved, extra coats should be charged out as a variation.
- The recommended viewing distance for paint work is 1.5 to 2 m which must be performed in a well lit area.
Backrolling is the process of following along behind the spay gun with a short to medium nap roller. This procedure is highly recommended when painting plasterboard surfaces.
Backrolling is required on level four or better surfaces.
It has three direct benefits:
- The rolling action assists in laying down (flattening) the ‘nap’ that can be raised both by the plasterer when sanding off set joints – and by the painter through the interaction of the spray with any loose paper fibres on the surface.
- The rolling action assists in working the paint into the textured paper surface of plasterboard.
- The roller imparts a surface texture to the freshly applied paint. The texture is helpful in disguising small variations in flatness which can occur – particularly over setting lines at the joints between the boards. It also disguises small variations in surface texture between the board and setting compound surfaces.
- The manufacturers of plasterboard have advocated the process of backrolling since the use of spray guns became common.
- Painters who do not backroll following spray paint application, face the possibility of being accused of not complying with recommended painting practice over plasterboard.
- The recommended system when painting plasterboard is:- a recommended sealer followed by two full coats of premium water based paint. As a minimum, the first (sealer) coat should be backrolled.
All preparation and painting works should be to the A/S 2311:2009 Painting of Buildings
Another helpful resource for homeowners along with painters alike is the Resene Painting video page. http://www.resene.co.nz/videos.htm and look for the Broadwall range of products.
We highly recommend a product like Resene Broadwall Surface Prep & Seal for plasterboard sealing and the Backrolling method be used.
PO Box 35-117, Shirley, Christchurch 8640, Christchurch, New Zealand