Pool Coping Replacement in Murphy, Texas

A 2000s building wave and its pool edges

Settlers drawn by Peters Colony land grants reached the area in 1846, the Handbook says, and the town was called Old Decator and then Maxwell's Branch before the St. Louis Southwestern Railway arrived in 1888 and residents renamed it for William Murphy, who gave land for the tracks and depot. The City's history adds that Comfort and Lydia McMillen and their six children came from Arkansas in 1846 and settled on a branch of Muddy Creek later named Maxwell Creek. Murphy shrank to 135 people by 1961 and lost its mail service in 1954, then grew from the mid-1970s as a commuter town for Plano and Richardson, reaching 1,547 people in 1990 and 3,099 in 2000.

Most of its houses came in the decade after that. The Census Bureau's 2020–2024 survey puts 63.6% of Murphy's homes in the 2000–2009 decade, 10.2% in the 1990s and 17.8% after 2009, with about half older than 2005, the median build year; the 2020 Census counted 6,083 homes, up from 5,196 in 2010. Nearly all, 97.7%, are single-family detached houses, owners live in about 93.7% of the occupied ones, and the survey's medians are $555,500 for an owner-occupied home and $175,699 for household income.

Stone or poured concrete for the new edge

Stone for a second set of coping splits two ways in the Natural Stone Institute's paving campaign. Limestone, marble and travertine are calcium-carbonate stones it places mostly indoors or in fairly controlled outdoor settings; granite, basalt, quartzite and sandstone belong to a harder group it describes as standing up better to abrasion and chemicals. Where summers are hot, the campaign notes, long hours of sun can change a stone's color and work on its movement joints. Poured coping is the other route: Mortex makes cantilever forms in Keystone, bullnose and French Curve profiles, and a Stone Edge form it says gives poured coping the look of natural rock.

Houston Black clay beside the coping

On the USDA Natural Resources Conservation Service soil map, Houston Black clay covers about 81.8% of Murphy: 67.3% on 1 to 3 percent slopes, 9.4% on 0 to 1 percent slopes and 5.1% on eroded 2 to 4 percent slopes. Austin silty clay takes 4.8% and 3.1% on two slope classes, and Burleson clay 3.4%. Houston Black here runs up to 55 percent clay, and NRCS puts its shrink-swell figure (maximum linear extensibility) at 12 percent. Soils that NRCS marks very limited for slab-built houses because they swell and shrink take in 84.9% of the town's mapped ground; those marks are about houses, and the agency gives none for pools or decks.

Where coping meets a concrete deck, the 2021 International Swimming Pool and Spa Code requires the isolation joint between them to be watertight, and wherever a deck joins existing concrete it calls for a joint that protects the pool from damage caused by relative movement. Marmiro Stones, which supplies stone coping, draws that joint as an unbroken gap running all the way around the pool and down through the deck, usually 1/2 inch to an inch across, and it holds off on caulking a fresh concrete deck for at least 30 days so the slab can cure and shrink first.

How a pool coping replacement runs

1. 01

   Permit and HOA check

   Murphy lists pools, decks, patios and concrete work among permitted projects and points owners to their HOA's deed restrictions, so both are asked about the coping before the job is booked.

2. 02

   Lift the old caps and roughen the wall

   With the old coping off, Unilock's method scarifies the top of the concrete pool wall so the mortar and new coping adhere, then dry-fits and cuts every piece.

3. 03

   Corners first, then the runs

   Unilock sets all 90-degree corners before the rest, keeps units to 72 inches or less on straight pools and 18 inches or less on curved ones, and prefers miter cuts.

4. 04

   Bed, overhang and slope

   Each unit goes down on concrete adhesive at the wall and a modified-mortar bed under the rest, overhanging about 2 inches and sloping at a 2% grade away from the water, with 1/4-inch joints of flexible exterior grout.

5. 05

   Seal the deck joint

   For its DECK-O-SEAL, W. R. Meadows wants the joint twice as wide as the sealant is deep, a sealant depth between 1/4 and 1/2 inch set by a foam backer rod, and no use at all in joints under 1/4 inch wide.