installing Terra Lana wool blend insulation

BEFORE YOU INSTALL

There are important things to know regarding installing home insulation. While the performance qualities of your insulation are critical, the way it is installed can be equally important.  If not installed correctly, things like gaps or inadequate coverage can severely compromise effectiveness.

 

SAFETY

 

ELECTRICAL HAZARDS

It is extremely important to be wary of electrical wiring. Take note where it is and ensure if cutting or stapling that you do so well clear of wires. If using electrical equipment (such as a stapler), use an RCD safety device.

Avoid pushing wiring forward against interior wall linings, as this can potentially be a hazard where people may put nails, etc into the walls.

If you are retrofitting an old house, make sure there is no unsafe old, live wiring.  You may need to get an electrician to check and clear any problems.

 

FIRE HAZARDS

Keep insulation clear of hot devices or surfaces such as downlights and chimney flues. There are legal requirement specifications for this according to situation. Refer to the insulation compliance standards guide.

 

SUPPORT IN CEILINGS

Most ceilings are not built to take any weight between rafters. If you accidentally step or kneel on the plasterboard you will fall through! A set of boards to lay across rafters and alternately shift along as you go may be a suitable solution.

 

INSECTS

It pays to check for whitetail spider infestation before crawling around in ceilings or underfloors. You may be able to tell by whether there are many other spiders about – if not, there could be whitetails (which eat the other spiders). If there is a concern you should wear protective skin covering clothing, or call in an exterminator.

 

HAZARDOUS OBJECTS

Take care to check for hazardous objects–ᅠbrokenn glass; rusty nails sticking out; protruding pipes; things to bump your head on!...  When working underfloors, it may be best to use mats to work on, or install ground cover sheeting first.

 

COMPLIANCE STANDARDS

 

Please read or download NZS4246 which is the New Zealand standard for installing insulation..

There are requirements to stipulate safe and effective use and performance of insulation. These include specifications for the thickness R value you will need; clearance from downlights; climate zones; access to electrical and plumbing, etc. These standards are required to be met for building code compliance and they also ensure your home is insulated safely and most effectively.

 

QUICK EASY HANDLING

 

Terra Lana is completely safe to handle, is non toxic and does not require breathing masks or protective clothing.

Terra Lana Ceiling insulations, Wall insulations and underfloor insulation can be easily ripped to length by hand. If you need to cut across the grain, this can be easily done with a pair of wool shears, strong scissors or knife.

 

 

CEILING SYSTEMS

 

BEFORE OR AFTER?

Depending on whether you are installing insulation before or after the house has finished being built, ceiling insulation can be installed either from above (in the attic space), or from below–ᅠbeforee the ceiling lining has been fitted.

 

ROOF TYPES

There are three different types of roof construction.  Each is insulated differently. Also depending on whether a new construction, or retro fitting, there can be different ways to install the insulation.

 

TRUSS ROOF

A truss structure roof is a triangular shape, making an area between the ceiling and roof – as an 'ATTIC' with a manhole. This is where there is an accessible space above the ceiling big enough for someone to at least crawl around in.  Insulation is installed over the ceiling part.

 

​SKILLION ROOF

This is where there is no open space between the ceiling and roof. Insulation may have been installed in the gap between ceiling lining and roofing material when it is built.  In most cases it is not possible to re-insulate a skillion roof structure after it has been built, unless removing the ceiling lining to gain access.

 

​MULTI-STOREY HOUSES

If your house is multi-story, it is the top storey ceiling that gets insulated, or wherever the ceiling has roof above it, not floors/rooms. The roof type will be one of the above. Insulation can also be installed in ceilings between storeys.

 

INSTALLING TRUSS ROOFS

There are three different ways to install Terra Lana insulation into a truss roof space.

 

DOUBLE LAYER SYSTEM

We recommend our proprietary double layer system.  By achieving the R value rating required using two thinner layers of insulation instead of one thicker, a complete ceiling coverage is achievable, as well as the elimination over any gaps.  The end result gives unparalleled performance and is the most efficient thermal barrier for the product used.

Terra lana double layer wool blend insulation system diagram illustration

 

 

SEGMENT SYSTEM

Thicker R value segments are in inserted between ceiling rafters

Terra lana wool blend insulation segment single layer system diagram illustration

 

BLANKET SYSTEM

Thicker R value insulation is rolled out across over the top of ceiling rafters.

Terra lana wool blend insulation single layer blanket system diagram illustration

 

INSTALLING

 

SAFETY FIRST

Terra Lana natural wool blend insulation can be safely installed without gloves or protective clothing.

Ensure 50mm clearance from metal flues or chimneys. Downlights require a 200mm gap between the downlight and the insulation, check the lighting manufacturer’s specifications or refer to Table 1 in NZS 4246:2006.

 

GENERAL

  • Check the description on the Terra Lana product label. Make sure you have the right product for the job
  • For optimum performance, use within 6 months of the date of manufacture (see pack label)
  • Always keep Terra Lana dry
  • Ensure a 25mm gap between Terra Lana and any building surface that is, or may become, damp
  • Don’t compress Terra Lana. Optimal thermal performance depends on it reaching its design thickness, which can take up to 3 months. Shaking before installation helps speed this process
  • Terra Lana can easily be ripped to size across its width. If you need to cut lengthwise, use shears or large scissors.

 

NEW CEILINGS

  • Terra Lana rolls are usually ideal; segments can also be used
  • Roll out the batting between the joists, ensuring an even, snug fit
  • If using segments ensure there are no gaps around the outer edges of the segments and no folds in the segments themselves. Where segments are butted together there should be no gaps between them.
  • Always allow a 25mm gap below any roofing membrane
  • If fitting from below, before the ceiling liner is installed, make sure Terra Lana is well supported with battens or strapping
  • Cover ALL the ceiling. Terra Lana should reach to at least the middle of the top plate of the exterior wall, and cover any internal walls.

 

PITCHED OR SKILLION ROOFS

  • Terra Lana is usually fitted from below before the ceiling lining is in place
  • Use pre-cut widths to ensure a snug fit
  • Where there are no battens or ceiling joists, staple Terra Lana directly to the rafters
  • Always allow a 25mm gap between Terra Lana and the roof underlay or roofing material.

 

installing Terra Lana wool blend insulation in pitched or skillion roof ceilings, illustration diagram

 

 

TERRA LANA DOUBLE LAYER SYSTEM

  • A double layer system increases the insulation (R-value) still further*.
  • Fit the first layer-usually 430mm wide
  • Lay the second layer in 1m wide strips, perpendicular to the bottom layer
  • If this isn’t possible, lay the top layer in the same direction as the bottom, making sure that the joins don’t coincide
  • Installation of a Terra Lana double layer system should be read in conjunction with instructions for “New ceilings.”

 

Installing Terra Lana wool blend insulation double layer system in truss roof ceiling

 

* Terra Lana double layer R3.8 system is more effective than other higher R-value products laid between joists.

 

RETROFITTING EXISTING CEILINGS

  • Terra Lana top-up products are designed to be installed over timber structures, perpendicular to the joists, rafters or trusses (check the product label to ensure you have the right product)
  • Make sure existing insulation is level and dry. Refit any displaced areas
  • Begin installing Terra Lana at the furthest point from your ceiling access
  • Use a pole to push Terra Lana into hard-to-reach corners, and over the exterior wall perimeter
  • Cover recessed areas with a piece of timber strong enough to stand on then insulate over the top of this.

 

Installing Terra Lana wool blend insulation double layer over existing insulation in truss roof ceiling

 

 

 

WALL INSTALLATION

 

SAFETY FIRST

Terra Lana natural wool blend insulation can be safely installed without gloves or protective clothing.

Ensure 50mm clearance from metal flues or chimneys. Check for electrical wiring.

 

GENERAL

  • Check the description on the Terra Lana product label. Make sure you have the right product for the job
  • For optimum performance, use within 6 months of the date of manufacture (see pack label)
  • Always keep Terra Lana dry
  • Ensure a 25mm gap between Terra Lana and any building surface that is, or may become, damp
  • Don’t compress Terra Lana. Optimal thermal performance depends on it reaching its design thickness, which can take up to 3 months. Shaking before installation helps speed this process
  • Terra Lana can easily be ripped to size across its width. If you need to cut lengthwise, use shears or large scissors.

 

PROCEDURE

Installing Terra Lana wool blend insulation  segment or roll in walls

  • Select the correct width product of Terra Lana rolls or segments for your wall structure (check product label). Width for insulation can be
    determined  by either the stud space width OR the dwang space height. Terra Lana may be installed with it's 'grain' either horizontal or vertical.
  • Fit the segment or roll to the underside of the top plate or dwang
  • Tear the batting 25mm greater than the cavity size
  • Use offcuts to fill any gaps around windows, doors or studs
  • Avoid any gaps, folds or tucking-in..

 

 

 

 

 

UNDERFLOOR INSTALLATION

 

 

BEFORE OR AFTER?

Depending on whether you are installing insulation before or after the house has finished being built, underfloor insulation can be installed either from above (before the flooring has been fitted) or from below. The method show below is for installing from beneath the floor.

 

SAFETY FIRST

  • Ensure a clear working environment -eliminate potential hazards such as sharp objects and obstructions
  • Identify all potential electrical hazards. Power cables must be identified to prevent staples piercing them during installation
  • Ensure a safe working clearance under the floor. At least 40cm clearance is required below the bottom of any bearer
  • Always ensure your RCD is plugged in.

 

PROTECTIVE CLOTHING AND EQUIPMENT

You will need:

  1. Overalls and safety goggles
  2. RCD isolating switch, extension lead and spotlight. Keep a spare bulb on hand
  3. A quality staple gun or hammer tacker, and 8-12mm staples.

 

PROCEDURE

  • Distribute the bags of product to the areas to be covered. Leave them bagged
  • Split the bags, or pull the Terra Lana from its outers. Run the Terra Lana in a continuous length between the floor joists and over the main bearers. Make sure the hard layer is towards the ground

 

Installing Terra Lana wool blend insulation under floor

 

  • Terra Lana is designed to friction fit most joist spacings. Push the Terra Lana lightly up to the bottom of the floorboards, while still retaining its loft. Staple through the bottom layer between 50mm and 80mm from the top of the joist.  The idea is to allow the insulation enough space to loft to its designed thickness but still have the insulation in contact with the underside of the floor.  At the end of the joists the stapling height should be closer 50mm below the top of the joist to ensure no air can circulate above the insulation, in the unlikely event a gap should open up.

 

Installing Terra Lana wool blend insulation under floor - fixing

 

  • Repeat this every 25 to 50cm, while keeping the Terra Lana firm and tensioned. Do not staple directly to the underside of the floor - this will compress Terra Lana and reduce its insulating properties. (NB: staples should only be fixed through the engineered polyester outer layer).
  • Where the floor joist spacings vary, measure the gap by holding Terra Lana up to the joist and simply rip across the roll to size, push into place and staple. Repeat until the joist row is complete . (NB: 1m wide rolls can be supplied to make this process easier)

 

Installing Terra Lana wool blend insulation under floor - rip to width

 

  • Clearances: Leave a clear 100mm gap around waste pipes that penetrate through the floor
  • On completion, remove all plastic bags and leftover material from the underfloor space
  • Staple a Product Information and Identification Certificate adjacent to the underfloor access for future reference.

 

DOWNLOAD INSTALL GUIDES »

INSTALLERS

 

INSTALLATION SERVICE PROVIDERS

There are many companies around New Zealand offering installation services for home insulation. To get the most from your Terra Lana insulation, it is best to use a provider who knows all about Terra Lana insulation.  Of course you'll also want to know you are getting a good deal – not just a cheap one – with professionals who know what they are doing and comply with quality and safety standards for insulation installation.

 

Terra Lana can recommend:

 

EnergySmart

EnergySmart are insulation installing experts who have been at it since Noah stuffed wool in the ark ceiling..  They provide a free assessment service, and are qualified as EECA administrators (they can install for government subsidies from EECA's Warm Up New Zealand programme). You will receive a certificate of compliance and quality guarantee.

You may get 'Charlie' to do it cheaper, but we don't think you'll find better value with their efficient, professional and very competitive service and importantly – getting it done right.

Green Dog Canterbury

Awarua Synergy Southland

Absolute Energy Nelson

Envirowool Southland

 

HOW TO INSTALL TERRA LANA INSULATION

ARCHITECTS // BUILDERS

HOME

© Terra Lana Products Ltd 2014 - 2017