Does Soffit Go Up Before Siding Goes On? Roofline Order of Work

Does soffit go on before siding? On a full exterior job, yes: fascia and soffit usually go up first, or at least before the top course of siding, so the siding can finish neatly against the soffit. The exceptions are jobs where only one of them is being replaced. Roof work comes before both, and eavestroughs go on last.

Does soffit go on before siding? The short answer

In most full re-clads, soffit and fascia go on before the siding. The top course of siding ends at the soffit, and it is much easier to fit siding to a finished soffit than to fit soffit around finished siding.

Crews do vary, and the product's installation instructions and the condition of the house decide the details. Treat the table below as the typical order, not a rule that every job follows.

Why soffit and fascia usually go up before the siding

• The soffit needs a channel on the wall. Soffit panels slide into a J-channel or F-channel fixed to the wall at one end and into a channel on the fascia at the other. Fixing the wall channel is simple on bare sheathing or house wrap. Doing it over finished siding is awkward.
• Siding ends against the soffit. The top course is trimmed to fit under the soffit, and it is held with a channel or utility trim. If the soffit is already in, the installer can measure and cut once.
• Finished siding gets scratched. Soffit work means ladders, scaffolding and tools against the wall.
• Water layers overlap correctly. The house wrap, flashing and trim are lapped so water sheds downward. Doing the roofline first means the wall layers go on over it in the right order.

Our guide to roofline soffit, fascia and trim combinations covers the visual side of the same edge.

Does soffit go on before fascia? The order at the roof edge

Fascia comes first, or at least the fascia repairs do. The soffit's outer edge is held by a channel fixed to the fascia or by the fascia cover's return, so the board has to be sound and straight. Many crews wrap the fascia and hang the soffit in the same visit. The rule that matters is that rotted fascia is replaced before either goes on. Wrapping over rot hides the problem and lets hangers pull out later.

The roof comes before all of it. On a reroof, wood repairs at the edge happen before the new roofing, and the drip edge and metal fascia are fitted so water runs over the trim, not behind it. If you are replacing the roof and the soffit in the same year, schedule them together. The scaffolding is already up, and any hidden rot that turns up in the soffit area gets fixed before the new edge goes on.

For choices of material, see soffit replacement options.

How siding finishes at the soffit

The top course of siding does not just stop. It is held in a receiving channel or utility trim set just below the soffit. Vinyl expands and contracts with the weather, so it is nailed in the centre of the slots and left loose enough to move. At the top, the same rule applies: leave room for movement and follow the manufacturer's instructions for the gap, rather than jamming the panel tight into the soffit channel.

Two details deserve a question to your installer:

• Added wall thickness. If rigid insulation board is going under the new siding, the wall gets thicker. That changes where the soffit's wall channel should sit, so the soffit work should be planned with the siding, not separately.
• Gable ends. Siding on a gable runs up to the rake trim, and soffit returns must line up with it. Gables are worth sketching out before work begins.

What goes wrong when the order is reversed

• Siding gets cut short or ragged at the top because the soffit line was not set yet.
• The soffit channel ends up fixed over finished siding, leaving gaps where water or insects can get in.
• Panels have no room to move at the top, which can lead to buckling or rattling.
• Finished siding is scratched, dented or stained by ladders and tools.
• New work hides a rotted soffit or fascia board that should have been replaced.
• Trim and flashing details get patched on afterward instead of laid out in order, and that is where leaks start.

Most of these are fixable but not for free. A crew that has to pull a finished course of siding to hang soffit has done the job twice. Our exterior renovation planning guide shows how to sequence a larger project so crews do not redo each other's work.

When only soffit or only siding is being done

Soffit only. The wall channel has to be fitted against a wall that already has siding. A careful installer works around it and may need to ease the top course. Ask how that edge will be finished and who is responsible for any siding damage.

Siding only. The installer works to the soffit already there. Look at the soffit first. If it is loose, damaged or rotted, replace it before the siding goes on, because loose soffit lets squirrels, raccoons, birds and wasps into the attic space.

Either way, keep the attic intake clear. Vented soffit is the intake half of attic ventilation, and it works with ridge or roof vents. Natural Resources Canada says to keep attic insulation from blocking the soffit vents, using baffles in each rafter space to keep the air path open. See soffit ventilation for how the airflow works.

Plan the schedule and ask for the sequence in writing

Ask your contractor to list the order of work in the estimate: roof, fascia, soffit, siding, then eavestroughs and downspouts. Ask who handles hidden rot found at the roof edge, and whether eavestroughs will be hung after siding, so they are not damaged by ladders and scaffolding. Colour matching matters too, since soffit, fascia and eavestrough are often colour-matched.

D&D Exterior Finishing handles siding, soffit, fascia, eavestroughs and capping, so the sequence can be one schedule instead of several crews arriving in the wrong order. The free written estimate lists the scope, materials and colours before work starts. See the soffit installation and replacement service for what is included.

Soffit and siding order questions

Does soffit go on before or after siding?

Usually before. On a full job, fascia and soffit go up first, then the siding finishes against the soffit. If only the siding or only the soffit is being done, the installer works around what is already on the house, so ask how the top edge will be finished.

Should I install soffit or siding first?

Soffit first, in most cases. The soffit sets the line the top course of siding meets, and installing it first keeps ladders and tools off finished siding. Roof work comes before both, and eavestroughs and downspouts are hung last.

Does soffit go on before fascia?

Fascia work comes first, or at least the repairs do, because the soffit's outer edge is held by a channel on the fascia or the fascia cover's return. Many crews wrap fascia and hang soffit in the same visit. Rotted fascia must be replaced before either goes on.

When to install soffit if I am replacing the roof?

Plan it with the roof. Wood repairs at the edge happen before new roofing, and the soffit and fascia can be done while the crew and scaffolding are on site. That also lets any hidden rot be found and fixed before the new edge goes on.

Do I need to replace soffit when replacing siding?

Not always. Replace it if it is loose, rotted, damaged or poorly ventilated, because those problems let animals and moisture into the attic. Sound soffit can stay, but the installer needs to plan how the new siding will finish against it.

Devon Moore, Operations Lead Co-Founder & Operations Lead — D&D Exterior Finishing

Devon Moore is the co-founder and Operations Lead at D&D Exterior Finishing, specializing in siding, roofing, windows, and exterior renovations across Waterloo Region.