Deck Installation in Scappoose, OR
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The soil survey for Scappoose shows two kinds of ground under the town. The sampled points along Highway 30 and in the blocks east and south of it fall on river terraces, well above the river, on two silt loams the survey names Quafeno and Latourell: the first moderately well-drained, the second well-drained, both old, firm ground. Along Scappoose Creek and South Scappoose Creek the map changes to floodplain soils. The one the survey calls Wapato it describes as poorly drained and "subject to occasional to frequent flooding for brief periods from December to April."
A deck stands in the ground on its own posts, and in Scappoose the ground it stands in is read before the footings are drawn. VResh Construction checks the survey for the address at the estimate visit and then checks the ground itself with a probe, because a map is a start and a hole is the answer.
On the terraces
The terrace soils show up under the downtown, south, and east residential streets in the survey, and a deck on one is built the way the main deck page describes, with footings set below the 12-inch frost depth the state code assigns to Columbia County. Quafeno ground has one habit worth knowing: its permeability is moderately slow, so after a wet stretch the top of the ground stays soft longer than a well-drained lot beside it would. Footings are sized to the load and to the soil's bearing class, and where the ground at footing depth is soft or wet, the estimate notes that the building department may want the soil looked at before it is poured.
Along the creeks
A creek-corridor lot is a different job because, for part of the winter, the water in Wapato ground is at or near the surface. A deck built to terrace habits there, low, with posts near grade, spends weeks each year with its feet wet. So on a creek lot, VResh builds up. Footings extend to firm soil and rise as concrete piers, so the post base sits clear of the wet-season ground. Framing near the ground is ground-contact-rated, regardless of the deck boards. The deck is kept high enough off the soil that air moves under it.
Where the parcel is one of the roughly 245 the city counts as partly or wholly in its floodplain, two more offices weigh in. The building department applies the code's flood-hazard provisions where they apply, which generally set the height of the framing against the mapped flood elevation rather than against where the winter water happens to sit, and the planning department applies the city's sensitive-lands rules, which cover development in the floodplain and along the creeks and decide whether a deck's footings and any grading fall under them. VResh asks both before the estimate is written, because the answers change the schedule as well as the footings.
What the ground does not change
The deck permit line is the state's, and Scappoose applies it as written: a deck more than 30 inches above grade, measured at any point within 3 feet of it, needs a building permit. The city accepts the state's prescriptive deck plans, and the Scappoose hub page carries how to apply. Setbacks and lot coverage are the planning department's and apply even to a deck that needs no building permit. Materials, railings, stairs, and the ledger are the main deck page's subject, built the same way on either ground.
Serving Portland Metro Area
VResh Construction provides window replacement, siding installation, roofing, dry rot repair and full exterior renovation services throughout the Portland metro area and Southwest Washington.
Portland Metro — Oregon
Southwest Washington
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Deck questions from Scappoose, OR
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We have a wealth of experience working as main building contractors on all kinds of projects, big and small, from home maintenance and improvements to extensions, refurbishments and new builds.
The ground work goes in dry
On a Scappoose deck, the footings are the part the ground decides, and on a creek lot, they are the part that waits for the dry season. Ask early, and the piers are in before the water comes back. Call or text (503) 272-6436.