TrussMetal is a metal fabrication shop in North Vancouver that works across Metro Vancouver. This page is for homeowners, strata councils, roofers and chimney installers.
A chase cover is the metal top that closes a framed chase around a factory-built chimney. Off-the-shelf covers come in set sizes, and a rusted cover lets water into the chase. We fabricate and supply covers made to the measured chase, for new chases or to replace a worn one.
Configurations
Replacement chase covers
For a cover that has rusted, sagged or lets water into the chase: a new cover made to the measured chase and the chimney already in it.
Covers for new chases
Made to the framer’s chase dimensions and the chimney maker’s instructions for the system being installed.
Multi-flue covers
One cover with two or more openings where a chase holds more than one chimney, spaced as the chimney maker requires.
Shaped to shed water
A cross-break or slope so water runs to the edges, turned-down drip edges all round and a raised collar at each opening.
Concept drawing
Concept drawing
Concept drawing
Concept drawings, illustrative only: not a tested design, a shop drawing or an installation detail, and not a photograph or record of completed TrussMetal work. Dashed parts are by others or bought in. Parts marked “if specified” are included only where the agreed design calls for them.
Cover, Cap and Shroud
Chase cover
The metal top over the framed chase, with an opening and collar for the chimney. This is what we make.
Termination cap and storm collar
Part of the chimney maker’s system, required by its instructions and installed with it. A chase cover doesn’t replace them.
Decorative shroud
An enclosure around the cap above the chase. Enquiry only: a chimney maker’s permission for a custom chase cover doesn’t extend to a shroud. We quote one only where the maker’s instructions for that exact system and configuration cover it and we can build to them; otherwise the maker’s own shroud, if it offers one, is the route.
Fitting Your Chimney
Your chimney system
The label on the chimney gives its maker, model and size. Before we draw, we check that maker’s current installation instructions for the chase top: the opening and collar, any spacers or airspace, clearances to framing and how far the chimney stands above the cover. Instructions differ between makers.
Not every system
Some chimney systems require the maker’s own chase top, flashing or shield, and some instructions don’t establish that a custom cover can be used. That is resolved with you and your installer before we accept an order; where the maker’s part is required, it is used and we don’t make a cover.
Water
Drip edges overhang the chase cladding, and the raised collar sits under the chimney’s storm collar so water runs off the cover instead of into the chase.
Not on this page
Crowns and caps on brick or stone chimneys, and vent terminations for gas appliances.
Materials
Stainless steel
304 stainless for most houses; 316 near salt water.
Galvanized steel
Galvanized sheet, powder coated to match the cladding where wanted. Coating is done by a specialist applicator.
Thickness
At least what the chimney maker’s instructions call for, and heavy enough to stay flat on a wide chase.
Who Does What
Responsibilities that affect the quote
TrussMetal: the chase cover, made to the chase measurements and the chimney maker’s instructions for the system, finished and supplied. Supply only.
Chimney installer or roofer: removing the old cover, installing the new one with the chimney’s own storm collar and cap, the roof and chimney interfaces, and sealing.
Owner or strata: access, and any permit or inspection the work needs.
Usually, where your chimney system’s instructions allow a custom cover. Send photos of the chase top and the chimney’s label, and the chase’s outside measurements.
Does the cover replace the chimney cap?
No. The cap and storm collar are part of the chimney system and stay.
Stainless or galvanized?
Stainless lasts longer without coating; galvanized steel is usually powder coated to match the cladding.
Can you make a decorative shroud?
On enquiry only, where your chimney maker’s instructions for that system cover it.
Do you install it?
We fabricate and supply it. Your chimney installer or roofer installs it.
Request a Quote
Send photos of the chase top and the chimney label.
What to include in your message
Photos of the chase top and the label on the chimney (maker, model, size)
Outside measurements of the chase, and where each chimney sits in it
Replacement or new chase, and what is wrong with the old cover
Stainless or galvanized, and colour
Who installs, and timing
The form starts blank: in “What do you need?”, select Other Custom Metalwork.
Prefer to talk it through? Call (778) 805-5333, Monday to Friday, 8:30 to 5:00.
