After buying an older home, deal with drainage and condition before appearance. Clear the gutters and confirm the downspouts discharge away from the foundation, then assess the roof, then identify what the exterior materials actually are before anything is washed. Older houses combine materials with very different tolerances, and the wrong method on inherited buildup causes damage that was not there when you bought it.
Key Takeaways
- Gutters and downspouts first, because water is the thing actively causing damage
- Identify every exterior material before choosing any cleaning method
- Inherited buildup can be hiding condition problems that need a repair, not a wash
- Older Philadelphia-area homes mix stone, stucco, painted wood, and later additions on one elevation
- The first year is for establishing a baseline, not for restoring everything at once
Prioritize Condition and Drainage Before Appearance
The instinct after closing on an older house is to make it look cared for, and the exterior is the visible half of that. It is the wrong starting point.
The right first question is what is actively causing damage right now, and the answer on almost every older suburban property is water. Gutters that have not been cleared, downspouts discharging at the foundation, a valley that has been overflowing for two seasons. Those are doing ongoing damage while a stained wall is merely unattractive.
The second question is what you actually own, materially. A house built in 1935 and extended in 1975 and again in 2005 has three generations of exterior material on it, and they do not share a cleaning method. Washing before identifying them is how new owners damage things in their first year.
The third question is what the previous owner's maintenance history was, which the buildup itself will partly tell you. A wall with fifteen years of growth is telling you something different from a wall washed last spring.
Appearance is worth addressing. It is just third in line.
First Inspection: Roof Edges, Gutters, Siding, Masonry, Windows, Walkways
Walk the property with a notebook in the first month, ideally during and after a decent rain.
Gutters and downspouts. Are they clear, do they have the right fall, do the seams leak, and crucially, where does each downspout discharge? Extensions removed and never replaced are extremely common and cheap to fix. Watch the system during rain.
Roof edges. Growth at the eaves, moss in valleys, condition of flashing at chimney and dormers, any sagging plane. Assess from the ground with binoculars. Note the roof material and try to establish its age from the disclosure or the inspection report.
Fascia and soffit. Peeling, staining, or soft wood tells you where water has been getting out of the gutter.
Siding and masonry. Identify each material and its condition. Look for the boundary lines between original construction and additions.
Foundation and grade. Does the ground fall away from the house? Is there efflorescence on the foundation wall? Is there a damp corner in the basement, and does it correspond to a downspout outside?
Windows. Frame condition, seal condition, and whether any have been painted shut or have soft sills.
Walkways and drive. Settlement, trip lips, moss in shaded sections, and drainage across them.
Our guide on signs gutters are damaging your home's exterior covers the water progression in detail.
Material and Surface Clues in Older Philadelphia-Area Homes
The regional building stock has recognizable patterns worth knowing.
Fieldstone and Wissahickon schist with lime mortar on pre-1940 houses across the Main Line and older suburbs. The mortar is softer than the stone by design and pressure washes it out. See protecting natural-stone walls and their mortar.
Three-coat stucco on 1920s and 1930s houses, and EIFS on 1990s and 2000s construction and additions. They look similar and tolerate very different treatment.
Painted wood frame, common on Victorians and older borough houses. Paint condition determines everything about the method.
Aluminum siding, postwar, which oxidizes to a chalky layer that burnishes if scrubbed aggressively.
Vinyl, usually a later re-side, frequently over the original material. Water driven under the laps goes into whatever is behind it.
Brick with original lime mortar, and often with later portland repointing on the same wall.
Slate roofs on the older housing stock, which are a different problem entirely. See why slate roof cleaning needs a different approach.
Mixed elevations are the norm rather than the exception: stone on the first floor with siding above, a stucco addition off the back, painted trim throughout. One method for the whole house is the wrong approach on almost all of these.
A Sequence by Risk, Access, and Season
A workable first-year order.
- Gutters cleared and downspouts extended. Cheap, fast, and it stops active damage. Do this first regardless of season
- Roof assessment. Not necessarily cleaning; establishing whether there is growth, damage, or remaining service life to plan around
- Material identification across all elevations, with photographs
- Any repair flagged by the inspection or by your own walk. Carpentry, repointing, flashing, paint failure
- Roof cleaning if warranted, before the walls, so runoff lands on surfaces still to be cleaned
- Siding and masonry, with the method matched per material and a test area on anything you are unsure of
- Windows and screens
- Hardscape last: walks, drive, patio, steps
- Set the ongoing schedule based on what you learned
Seasonally: gutters and drainage work any time. Washing chemistry wants temperatures above freezing, so late spring through early autumn. Roof and elevated work wants settled weather. If you close in November, do the gutters immediately and plan the rest for spring rather than forcing it.
What to Document in the First Year
This is the part new owners skip and later wish they had not.
- Photograph every elevation before any work, in good light. This is your baseline, and in five years it is the only way to know whether something is advancing
- Photograph during rain, showing where water runs and where it pools
- Note every material by elevation and section, including where additions meet original construction
- Keep the inspection report accessible and cross-reference your own observations against it
- Record what you clean, when, and by what method. Next time you will know what worked
- Note the trees, which drive gutter frequency and growth rate, and which of them overhang the roof
- Track how fast growth returns on each elevation. That tells you the real interval for this property, which is more useful than any general recommendation
- Keep any contractor's condition report, which is often more valuable than the cleaning itself
Common Mistakes When Cleaning Inherited Buildup
- Pressure washing everything. The single most common and most expensive first-year mistake, particularly on stone with lime mortar, stucco, and painted wood
- Washing before identifying the materials
- Washing before fixing the water. The stripe on the siding comes back within a season if the gutter above it still overflows
- Assuming heavy buildup means neglect rather than a condition problem. Sometimes the growth is concentrated because something is keeping that wall wet
- Removing buildup that was hiding a repair and being surprised. Better to expect it
- Treating an addition like the original house, or vice versa
- Doing everything in the first three months. Spreading work across a year lets you see the property through a full weather cycle first
- Skipping the test area on anything unfamiliar
- Cleaning a roof that is near replacement
Request a Site-Specific Exterior Assessment
A first-year assessment on an older property is worth more than a first-year cleaning. WashLabs Exteriors will identify the materials, assess condition and drainage, tell you what is a repair rather than a wash, and give you a sequence rather than a single quote.
Call (610) 665-3995 or request a free assessment. See our services and the service areas we cover across the Philadelphia suburbs.