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Concrete and terracotta self-venting roof tiles are installed among ordinary tiles to create a low- and high-level ventilation path through a tiled roof. The Building Centre Network’s installation sheet places the inlet four courses above the gutter and the outlet on the opposite roof side, three or four courses below the ridgeline; its separate new-home note places the outlet two courses from the ridge capping. Those are installation recommendations from a 2009 product document, not independent airflow results.
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The guide below explains what the document actually covers, how its fitting sequence works, and what must be confirmed before ordering a vent for a concrete or terracotta roof. The source does not publish current dimensions, airflow ratings, tile-profile compatibility or stock, so a supplier or roofing contractor must verify those points for the particular roof.
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What does the Building Centre Network document describe?
It describes a “Terracotta ventilation system” made by fitting self-venting roof tiles within an existing tiled roof. The vent replaces or occupies the position of a normal tile and is integrated with the courses above and below it. Air enters at a lower point and exits at a higher point, rather than through a freestanding roof cowl or a visible mechanical fan.
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The document is an installation instruction sheet, not a current catalogue. Its footer identifies copyright 2009 and its contact block is Australian. Read it as product-specific guidance for the system shown in that sheet. It does not establish that every vent sold today, or every concrete or terracotta tile profile, can be fitted using exactly the same dimensions or cut-outs.
The official sheet is the primary reference for the sequence and locations discussed here: Building Centre Network’s installation instructions for the Terracotta ventilation system.
Where should the inlet and outlet vents go?
For the layout shown in the document, put the inlet four courses above the gutter and the outlet on the opposite roof side, three or four courses below the ridgeline. For a new home, the sheet gives a separate instruction of two courses from the ridge capping; confirm with the supplier how that note applies to the specific roof design.
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| Vent | Position stated in the document | Why the location matters during fitting |
|---|---|---|
| Inlet | Four tile courses above the gutter | Leaves the vent within the lower roof field while retaining a continuous gutter-side tile arrangement. |
| Outlet | Three or four courses below the ridgeline on the opposite roof side | Creates a high exit point separated from the inlet. |
| New-home outlet note | Two courses from the ridge capping | Apply only after the roof designer or installer confirms the document’s intended measurement for that build. |
“Course” means a horizontal row of tiles, but roof profiles vary in how rows overlap and where a vent can physically sit. Count the rows on the installed roof rather than relying on a nominal tile length. Mark the proposed positions from the gutter and ridge, then check that the vent body, laps and surrounding tiles do not collide with battens, flashings or other roof details. The document does not provide a universal opening size or a drawing for every profile.
How do you fit a self-venting tile according to the instructions?
The sheet’s sequence is straightforward, but each step depends on a trial fit and careful water-course detailing. Have the correct vent for the installed profile, plumber’s silicone and a hammer available before disturbing any tiles; arrange safe roof access separately.
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- Confirm the position and profile. Select the inlet or outlet location using the course recommendations above. Verify with the supplier that the vent is made for the roof’s concrete or terracotta profile. The source does not list compatible profiles, so this confirmation cannot be skipped.
- Remove the tile at the marked location. Lift out the ordinary tile that the vent will replace. Protect adjacent tiles from impact and keep track of how their laps and support points are arranged.
- Expose and prepare the sarking. If sarking is present, cut and fold it as directed by the installation sheet so the vent can pass through the roof covering. Do not leave loose membrane edges where they can obstruct the vent or the water path; use the installer’s approved method for securing the fold.
- Check the tiles above. The instructions allow the lugs on tiles above the vent to be adjusted as needed. Make the smallest adjustment required for the vent to sit correctly, and do not remove support or alter a tile until the installer has confirmed that the profile and overlap remain sound.
- Trial-fit the vent. Place the vent without sealant first. Check that its edges align with the surrounding tiles, that the tiles above can sit on it, and that the intended water course remains open. A trial fit is the point to correct alignment, not after silicone has cured.
- Apply silicone to the tile below. The sheet specifies plumber’s silicone on the tile below the vent. Use a compatible product and apply it where the vent and lower tile need to seal, keeping sealant out of the drainage path.
- Install the vent. Set the vent into the prepared opening and align it with the neighboring tiles. Press it into the sealant sufficiently to form the intended seal without forcing the unit out of profile.
- Seal the upper interface. The document specifically cautions that the places where tiles above sit on the vent must be sealed without blocking the water course. Seal the contact area while leaving water a clear route down the roof. A continuous bead across the drainage channel can turn a ventilation installation into a leak risk.
- Recheck every lap. Before leaving the roof, inspect the vent-to-tile junctions, the folded sarking and the rows above and below. Look for displaced tiles, pinched membrane or sealant that has bridged a channel. Follow the silicone manufacturer’s cure instructions before exposing the joint to weather.
The instruction sheet names a hammer and plumber’s silicone as required items. It does not specify a universal sealant brand, bead size, fastener pattern or membrane repair tape. Those details depend on the actual vent and roof assembly and should come from the current supplier instructions.
Does the guidance apply equally to concrete and terracotta tiles?
No. The supplied document uses “terracotta ventilation system” and “self-venting tiles”; it does not publish a concrete-tile model or prove compatibility with every concrete profile. A concrete roof may have different thickness, underside geometry, lug positions and overlap dimensions, so a terracotta vent should not be assumed to fit it.
Before buying, obtain the vent’s current installation drawing and ask for confirmation in writing of:
- the exact tile manufacturer and profile the vent is designed to replace;
- the vent’s overall dimensions and required roof opening;
- how the upper lugs, lower support and side laps interface with that profile;
- whether the product is intended for concrete, terracotta, or both;
- the required treatment of sarking, battens and underlay; and
- the approved sealant, fixing and weatherproofing details.
If the supplier cannot identify the matching profile, stop before cutting the roof covering. A visually similar tile can still have incompatible laps or support points. The Building Centre sheet is useful for understanding the intended installation, but it cannot substitute for a current compatibility schedule.
What finish options are available?
The document says vents may be supplied pre-painted or powder-coated. It also permits painting an unpainted self-venting tile after installation. Its exact wording is: “If you have not pre painted your self-venting tiles, you can do so now.”
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Painting is a finish step, not a repair for a poor fit. Complete the alignment, sealing and water-course checks first. Use a coating system approved for the vent material and the roof environment, and follow the coating maker’s preparation and curing instructions. The 2009 sheet does not identify current paint chemistry, colour ranges or a guaranteed service life, so obtain those details from the present supplier if colour matching or recoating is important.
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1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsWhat information is missing from the published sheet?
Several facts a buyer may expect in a modern product data sheet are absent. The document gives no airflow rating, free-area figure, pressure-drop result, acoustic data, thermal performance, dimensions, weight, wind classification or test standard. It also does not state a current model number, warranty, price, retailer stock or a list of tile profiles.
That absence does not mean the vent has no performance; it means the supplied source does not substantiate a numerical claim. Treat statements such as “high airflow,” “universal fit” or “weatherproof in all conditions” as unverified until the current manufacturer provides supporting documentation. For a compliance-sensitive project, ask the roofing professional which local code, approval or certification applies and retain the product sheet with the project records.
How should you plan an inlet-and-outlet installation?
Plan the complete path before removing tiles. The source’s two-vent arrangement works only if the inlet and outlet are separated on the roof and the surrounding tile courses can be restored without interrupting drainage.
- Map the roof planes. Draw the gutter, ridge, valleys, penetrations and existing roof openings. Identify the opposite roof side recommended for the outlet.
- Count courses physically. Mark four courses above the gutter for the inlet and three or four below the ridge for the outlet, then compare those marks with battens and obstructions. For new construction, discuss the separate two-course-from-ridge-capping note with the designer.
- Check access and sequence. Decide how a roofer will reach each position without loading fragile tiles or stepping on the vent. The document does not provide a safe-access method; use a qualified roofing contractor where roof work is hazardous.
- Confirm materials. Have the matching vent, replacement tiles if a breakage occurs, plumber’s silicone and any supplier-specified membrane materials on site.
- Record the installation. Photograph the vent before surrounding tiles are closed up and note the product profile, location and sealant used. This record helps with future maintenance or a leak investigation.
What common mistakes can cause leaks or a failed installation?
Most avoidable problems come from treating the vent as a cosmetic replacement tile instead of part of the roof’s drainage path.
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- Choosing by appearance alone: A vent that looks close to the existing tile may not match its laps or lugs. Obtain profile confirmation first.
- Putting both vents on the same unsuitable area: The sheet calls for the outlet on the opposite roof side. Recheck the layout instead of improvising a location beside the inlet.
- Skipping the trial fit: Sealant cannot correct a body that sits too high, low or sideways. Dry-fit and adjust before applying silicone.
- Blocking the water course: The upper seal must protect the joint without damming water. Inspect the channel after the bead is applied.
- Leaving sarking unmanaged: A cut membrane that is folded into the opening can interfere with the vent or drain incorrectly. Follow the current membrane and vent instructions.
- Painting before sealing: Coating first can hide the joint and make later preparation difficult. Finish the weatherproofing checks, then paint if the product allows it.
- Assuming the 2009 sheet is current: Product dimensions, finishes and approvals can change. Request the latest installation document and stock confirmation for the exact model.
If water appears after installation, do not add random sealant over the visible edge. Have a roofer inspect the vent position, upper laps, lower seal, sarking fold and adjacent tiles to identify the entry path. A blocked channel or displaced neighboring tile may be the actual cause.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Should a homeowner install these vents?
The sheet is written as fitting guidance, not as a declaration that roof work is suitable for an untrained person. Working on a pitched roof introduces fall, tile-breakage and weather risks, and opening the roof can affect the building envelope. Use a qualified roofer where access is difficult, the roof is steep or fragile, the membrane is complicated, or local rules require licensed work.
Give the contractor the current vent instructions, the tile profile and the proposed inlet/outlet sketch. Ask the contractor to explain how the water course will remain open and how the sarking will be restored. A clear answer on those two points is more useful than a generic promise that the vent is “universal.”
How can you verify a product before ordering?
Use a short document check rather than relying on a marketplace photograph:
- Match the product name and material to the installed tile: concrete or terracotta.
- Request a dimensioned drawing and the compatible tile-profile list.
- Confirm whether the product is an inlet, outlet or interchangeable vent.
- Ask for current airflow or performance data if the project requires a numerical design value; the Building Centre sheet supplies none.
- Confirm finish options, including pre-painted, powder-coated and paint-after-installation choices.
- Obtain the current installation sequence, sealant specification and warranty.
- Confirm availability and delivery before removing any roof tile.
This process separates what the historical instruction sheet establishes from what only a present-day supplier can establish. It also prevents a roof from being opened for a product that cannot be matched to the installed profile.
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What is the practical verdict?
The Building Centre Network sheet gives a usable layout and fitting sequence: inlet four courses above the gutter, outlet three or four courses below the ridge on the opposite side, careful trial fitting, silicone at the lower tile and sealing that preserves the water course. It also confirms that the vent can be supplied finished or painted after installation.
Its limits are equally important. Because the document is from 2009 and does not state dimensions, airflow, concrete compatibility or current availability, treat it as historical product-specific guidance. Before purchase or installation, obtain current supplier documentation for the exact concrete or terracotta tile profile and have a competent roofer confirm the weatherproof detailing.
Frequently Asked Questions
Can I use one self-venting tile without an inlet and an outlet?
The supplied sheet describes separate inlet and outlet positions, so it does not establish a one-vent design. Whether a single vent is appropriate depends on the roof layout and the current product instructions; ask the supplier or roofing designer for a documented arrangement.
How do I know how many tile courses my roof has?
Count the visible horizontal rows from the gutter upward on the roof plane where the vent will sit, and mark the proposed row before removing a tile. Because profiles and eaves details vary, have the installer confirm that the counted row also leaves room for the vent’s laps and the underlying battens.
Is powder coating better than painting an unpainted vent on site?
The document lists powder-coated and paint-after-installation options but does not compare their durability or colour retention. Select the finish based on the current supplier’s coating specification and the roof’s exposure, rather than assuming one option is universally superior.
Where can I find airflow figures for a terracotta roof vent?
The Building Centre Network installation sheet contains no airflow rating or free-area figure. Request a current technical data sheet or test report from the vent supplier if ventilation calculations or compliance documentation require a numerical value.
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