Repair aluminum siding when the damage is limited to a few dented or loose panels, the walls underneath are dry and solid, and you can source matching pieces. Replace it when the finish is chalking and faded across the whole house, dents and loose panels show up on several walls, or you are already chasing moisture problems underneath. Painting is a legitimate middle option if the metal is sound and you mainly hate the color.
Thousands of homes across Penn Hills, Monroeville, Plum and the older boroughs got aluminum siding between the 1950s and the 1970s. The question is whether yours is still doing its job or just covering up problems.
What usually goes wrong with old aluminum siding?
Aluminum does not rot, and insects ignore it. What fails is the finish, the fastening and the shape of the panels.
- Chalking. The factory paint oxidizes over decades. Rub the wall with your hand and it comes away white or colored with powder. Rain streaks the chalk down onto brick, foundations and walkways.
- Fading. South and west walls fade first, so one side of the house no longer matches the other.
- Dents. Hail, baseballs, ladders, snow blowers and lawn mower stones all leave marks. Aluminum dents and stays dented.
- Loose or rattling panels. Panels unlock from each other in high wind, especially during our November windstorms, and nails back out as the house moves through freeze thaw cycles.
- Bent corners and trim. Corner posts and window trim take the most abuse and often look worst.
None of these alone means the siding has to go. What matters is how many walls are affected and what is going on behind the panels.
Can you still find matching aluminum siding panels?
Usually not new. Most aluminum profiles and colors installed in the 1960s and 1970s are long discontinued, and even a “white” panel from 1972 has faded to its own shade by now.
The practical fix is salvage. A good repair crew pulls matching panels from a hidden spot, such as the back of a detached garage or a wall behind a deck, uses them on the front of the house, and fills the hidden spot with the closest available panel. This works well for a handful of panels. It stops working when damage is spread across the front and sides and there is no hidden wall left to borrow from.
Is painting aluminum siding a good option?
Yes, if the panels are tight, mostly straight and you just want a fresh color. Painted aluminum siding can look good for many years when the prep is done right.
The prep is the whole job. The chalk has to be washed off completely, usually with a cleaner and a soft wash rather than a high pressure blast that can drive water behind the panels. Bare or oxidized spots need a primer rated for metal, and the finish coat should be a quality exterior acrylic made for that surface. Skip the cleaning and the new paint peels in sheets.
Keep in mind what painting does not fix. It will not remove dents, tighten loose panels, add insulation or tell you anything about the condition of the wall behind it.
What is under aluminum siding on older Pittsburgh homes?
This often decides the repair or replace question. On homes from this era, aluminum was usually installed right over whatever was there. Common findings include:
- Original wood clapboard, often with several layers of old paint. In homes built before 1978 that paint may contain lead, and the older the house, the more likely it is.
- Asbestos cement shingles, the stiff gray or white tiles common on western PA homes from the 1920s through the 1950s. These are stable when left alone but must be handled under asbestos rules if removed.
- Thin fiberboard backer or nothing at all, which means little to no added insulation.
- Hidden rot at window sills, the band board above the foundation, and below leaky gutters or roof to wall intersections.
Because of the lead and asbestos possibilities, any contractor disturbing painted surfaces on a pre 1978 home should follow the EPA lead safe work practices for renovation. You can read the homeowner guidance at the EPA lead information page. If asbestos siding is underneath, a good contractor will tell you whether it can be left in place and covered or needs abatement before new work.
When does replacing aluminum siding make more sense?
Replacement wins when the problems are spread out or when the wall itself needs attention. Here is how we usually sort it out on an inspection.
| What you see | Usually the better move |
|---|---|
| A few dents or loose panels on one wall, rest of the house tight | Repair with salvaged panels |
| Heavy chalking and fading but panels straight and tight | Professional cleaning and paint, or replace if you want lower maintenance |
| Dents and loose panels on three or four sides | Replace |
| Soft wood, stains or peeling paint inside near exterior walls | Replace, so the wall can be opened and repaired |
| Planning new windows or a new roof soon | Replace together so trim, flashing and siding tie in correctly |
When we replace, the old aluminum comes off, the sheathing gets inspected and repaired, a weather resistant barrier goes on, and the new siding is installed with proper flashing at windows, doors and the roof line.
Should you replace aluminum siding with vinyl or James Hardie?
Most homeowners in our area choose between two options.
Vinyl siding is the most common replacement. Modern vinyl holds color far better than old aluminum, will not chalk the way that old factory paint did, and will not dent the way aluminum does. Insulated vinyl adds foam backing for a straighter wall and some added insulating value. It is the most budget friendly way to get a low maintenance exterior.
James Hardie fiber cement costs more but gives you a heavier, more solid look with deeper shadow lines that suits older brick and frame neighborhoods. It is noncombustible, resists dents and rot, and the factory ColorPlus finish holds up well in our freeze thaw climate. Our James Hardie vs vinyl siding comparison walks through the tradeoffs in more detail, and our siding cost guide for Pittsburgh explains what drives the price of each.
Frequently Asked Questions
How long does aluminum siding last?
The metal itself can last 50 years or more because it does not rot or rust. The factory finish is what wears out, usually showing heavy chalking and fading after 25 to 40 years. Many original installations in the Pittsburgh area are now past that point.
Can I pressure wash aluminum siding?
Gently, and with caution. High pressure can force water behind the panels and strip what is left of the old finish. A soft wash with a siding cleaner and a brush removes chalk with far less risk.
Is it worth repairing aluminum siding on a house I plan to sell?
Fixing obvious dents or loose panels before listing is usually worth it. A full replacement before selling makes sense only if the siding is visibly failing or hiding moisture damage that an inspector would flag.
Does removing aluminum siding mean dealing with asbestos?
Only if asbestos cement shingles are underneath, which is common but not universal on older western PA homes. A contractor can usually tell by checking an inconspicuous spot. If they are present, they can sometimes be left in place under the new siding, or removed by a licensed abatement company first.
Can new siding go right over old aluminum?
It is possible but rarely a good idea. Covering it hides any rot or moisture problems, makes window and trim details harder to flash correctly, and leaves you with an uneven base. Removing the aluminum lets the wall be inspected and repaired before new siding goes on.
If you are not sure whether your aluminum siding needs a repair, a coat of paint or a full replacement, call Bella Construction at (724) 515 5163 for a free inspection and an honest answer. You can also learn more about our aluminum siding services or request a free exterior estimate online. Fall schedules fill quickly, so it pays to get the wall looked at before winter.