Swollen Bottom Courses Usually End The Repair Conversation

The sprinkler head at the northeast corner of a 1968 Mahomet ranch has been clipping the same eight feet of hardboard siding every other morning for eleven years. By the time a second painter refuses to warranty a repaint over the swollen bottom courses, most owners in that house are already pricing siding contractors Mahomet IL instead of buying another five gallons of primer. Here is the argument, stated plainly: once the board itself has swelled and delaminated, replacement paid out of a monthly reserve costs less across the next decade than a repaint cycle that no longer holds. Paint fails on a bad substrate. It does not fix one.

Repair Buys Time Until The Substrate Swells

Spot repair works right up to the point where the material stops holding a fastener. Original hardboard siding, standard on Central Illinois houses built between the mid-1960s and the mid-1980s, wicks water at its cut edges. What usually turns up on these ranches is one soft course along the whole irrigated side while the gable ends, eight feet up and dry, look nearly new. If the swelling is confined to two or three boards near a downspout, cut them out, replace them, and move on. Call that a good afternoon’s work.

The line gets crossed when the delamination runs continuously and the sheathing behind it has darkened. A patch there is cosmetic, because the water is already past the siding, and every new board fastened into soft substrate becomes the next failure point. Two painters declining to warranty the work is not squeamishness. It is a trade telling you the surface will not hold their product.

Questions That Decide Repair Or Replacement

You can settle most of this yourself with a screwdriver and twenty minutes. Press the tip into the bottom edge of a swollen board; if it sinks in past the paint without stopping at solid wood, that board is done, and so is its neighbor. Then count how much of the wall does that. Under roughly a tenth of the surface, repair still makes sense. Past a quarter, you are paying twice.

Can I Just Replace The Bottom Two Courses?

Often yes, and it is worth asking. The catch is matching the profile and thickness of siding that stopped being made decades ago, so the patch can read as a stripe across the front. On a back wall nobody sees, that trade is easy.

How Long Should The New Siding Last?

Vinyl is commonly quoted at twenty to forty years and fiber cement at up to fifty, depending on exposure and installation. The install matters more than the brochure. Ask how the crew handles the first course and the flashing at grade, because that is where this house failed the first time.

What Do I Do About The Sprinklers?

Change the arc or move the head before the new wall goes up. Water hitting the same courses every morning will find the cut edges of whatever material you choose. A five-minute timer adjustment protects a five-figure investment.

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Budget The Replacement Before The Painter Quits

Ten years ago, repainting was the obvious move. Paint was cheap, crews had open weeks in October, and a careful primer job over sound board bought five or six years. The material half of that math has held. The labor half has not. A This Old House cost breakdown from August 2026 puts labor at roughly 65% of a total roof replacement cost, with roofers running about $75 an hour, and exterior trades in this market price off the same labor pressure. Every repaint you buy now is a bigger share of what the permanent fix would have cost.

A 1968 house adds a rule that comes before any quote. The U.S. EPA warns that structures built before 1975 commonly contain asbestos in exterior siding, cement shingles and pipe wrap, and homeowners should never sand, cut, break or power-wash that material. Have it tested before anyone touches the wall. Removal is work for a certified abatement contractor, not a Saturday with a circular saw.

Now the reserve. Say the wall on that 1,400-square-foot ranch runs $16,000 to $22,000 installed in insulated vinyl, an illustrative range for a house this size rather than a quote. At $150 a month, seven years of setting money aside adds up to about $12,600, so the gap at the low end is a few thousand dollars and not the whole job. A reserve fund is patient; paint is not. Owners who keep repainting a failing wall spend maybe $2,500 to $3,500 a cycle, and after two of those they have funded a third of the replacement and still own the same wall.

So get the number before the painter quits on you, not after. Two written quotes in hand tell you whether the reserve is three years short or three months short, and the siding contractors Mahomet IL owners keep hiring get busy fast once October weather arrives. The bottom courses are not going to firm up on their own. Price the replacement while you still get to choose the timing.