{"product_id":"gray-granite-1-5","title":"Gray Granite 1.5\"","description":"\u003cp\u003e\u003cstrong\u003eGray Granite 1.5\" — Heavy-Duty Stone for Deep Drainage \u0026amp; Backfill\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eAlso sold as \u003ca href=\"https:\/\/ottrsupply.com\/products\/4-stone\" title=\"#4 Stone (Crushed Granite Ballast)\"\u003e#4 Stone (Crushed Granite)\u003c\/a\u003e — the contractor spec name for the same material (AASHTO M43 \/ ASTM D448 No. 4).\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003eGray Granite 1.5\" is the size that drainage installers, septic contractors, and excavators reach for when the project calls for serious water-moving capacity. The larger void space between stones means water flows through fast — critical for French drains, septic system bedding, and any application where the job is to get water out and away.\u003c\/p\u003e\n\u003ch3\u003eAt a glance\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCrushed granite, native to the Boston area\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1.5\" nominal — angular, crushed, clean of fines\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCoverage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e~27 cubic feet of trench per yard\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e~2,500 lbs\/yd³ (~1.25 tons)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAlso known as\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e#4 stone, ballast stone, 1.5\" crushed gray, large drainage rock, septic stone\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSold by\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eThe cubic yard, bulk dump truck delivery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eWhat it's good for\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDeep French drains and footing drains around foundations\u003c\/li\u003e\n\u003cli\u003eSeptic system pipe bedding and trenching\u003c\/li\u003e\n\u003cli\u003eStorm drain systems and dry-well construction\u003c\/li\u003e\n\u003cli\u003eRetaining wall backfill behind block and stone walls\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow much do I need?\u003c\/h3\u003e\n\u003cp\u003eA 100' French drain trench (12\" wide × 24\" deep) needs about 7.4 cubic yards. Backfilling a 50' segmental retaining wall (12\" deep gravel zone behind the block) takes roughly 3.7 yards. Septic pipe bedding sizes are dictated by the engineered design — your installer will give you the exact volume.\u003c\/p\u003e\n\u003ch3\u003eHow Gray Granite 1.5\" compares\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. Gray Granite ¾\":\u003c\/strong\u003e 1.5\" is the deeper-drainage size with bigger voids and faster water flow. ¾\" is the driveway standard.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. Rip Rap 6\"–12\":\u003c\/strong\u003e Rip rap is much larger — used for erosion control along shorelines, ditches, and high-energy stream banks. 1.5\" sits below rip rap in scale.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. Crushed Concrete 1\" to minus:\u003c\/strong\u003e Crushed concrete is dense-graded with fines for compaction. 1.5\" gray granite is clean for drainage. Different jobs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. Blue-Gray Granite ¾\":\u003c\/strong\u003e Different color and smaller size; ¾\" is finish gravel, 1.5\" is drainage rock.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently asked questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is Gray Granite 1.5\" used for?\u003c\/strong\u003e\u003cbr\u003eHeavy drainage, foundation backfill, large culvert bedding, septic system stone, and the transition layer between rip rap and finer drainage rock. It is reserved for deeper, higher-flow applications than the ¾\" residential standard.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs Gray Granite 1.5\" the same as #4 stone?\u003c\/strong\u003e\u003cbr\u003eYes — gradationally, 1.5\" gray crushed granite meets AASHTO M43 \/ ASTM D448 No. 4. The residential descriptor and the contractor spec name point to the same material.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill this stone clog up?\u003c\/strong\u003e\u003cbr\u003eNo. Because it's clean of fines, the void space between the stones stays open and water flows freely. Wrap the trench in non-woven filter fabric to keep silt and fines from migrating in from the surrounding soil.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow deep should a French drain be?\u003c\/strong\u003e\u003cbr\u003eFor typical residential downspout dispersal, 18–24\" deep × 12\" wide works. For foundation drains around a full basement, follow the engineer's spec — usually 24\"+ deep wrapped in filter fabric at the footing.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow much does a cubic yard of 1.5\" gray granite weigh?\u003c\/strong\u003e\u003cbr\u003eAbout 2,500 lbs per cubic yard, or roughly 1.25 tons.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo you deliver drainage stone in the Boston area?\u003c\/strong\u003e\u003cbr\u003eYes — same-day and next-day bulk delivery across Suffolk, Middlesex, Norfolk, and Plymouth Counties.\u003c\/p\u003e\n\u003cp\u003eSame-day and next-day bulk delivery, no minimum order. We run drainage stone routes across \u003ca href=\"https:\/\/ottrsupply.com\/collections\/plymouth-county-landscape-supply\"\u003ePlymouth\u003c\/a\u003e, \u003ca href=\"https:\/\/ottrsupply.com\/collections\/middlesex-county-landscape-supply\"\u003eMiddlesex\u003c\/a\u003e, \u003ca href=\"https:\/\/ottrsupply.com\/collections\/norfolk-county-landscape-supply\"\u003eNorfolk\u003c\/a\u003e, and \u003ca href=\"https:\/\/ottrsupply.com\/collections\/suffolk-county-landscape-supply\"\u003eSuffolk County\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003ePair with our \u003ca href=\"https:\/\/ottrsupply.com\/products\/gray-granite-0-75\"\u003egray granite ¾\"\u003c\/a\u003e for the upper drainage layer or driveway top coat above, or our \u003ca href=\"https:\/\/ottrsupply.com\/products\/septic-sand\"\u003eseptic sand\u003c\/a\u003e for Title 5 leach field installations alongside.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOrder today — the heavy-duty drainage stone for jobs that need real flow capacity.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What is Gray Granite 1.5 inch used for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Heavy drainage, foundation backfill, large culvert bedding, septic system stone, and the transition layer between rip rap and finer drainage rock.\"}},{\"@type\":\"Question\",\"name\":\"Is Gray Granite 1.5 inch the same as #4 stone?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. 1.5 inch gray crushed granite meets AASHTO M43 \/ ASTM D448 No. 4 specifications.\"}},{\"@type\":\"Question\",\"name\":\"Will this stone clog up?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. Because it is clean of fines, the void space between stones stays open and water flows freely. Wrap the trench in non-woven filter fabric to keep silt out.\"}},{\"@type\":\"Question\",\"name\":\"How deep should a French drain be?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"For typical residential downspout dispersal, 18 to 24 inches deep by 12 inches wide. For foundation drains around a full basement, follow the engineer's spec, usually 24 inches or more wrapped in filter fabric at the footing.\"}},{\"@type\":\"Question\",\"name\":\"How much does a cubic yard weigh?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"About 2,500 lbs per cubic yard, or roughly 1.25 tons.\"}},{\"@type\":\"Question\",\"name\":\"Do you deliver drainage stone in the Boston area?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. Same-day and next-day bulk delivery across Suffolk, Middlesex, Norfolk, and Plymouth Counties.\"}}]}\u003c\/script\u003e","brand":"Ottr Landscape Supply","offers":[{"title":"Default Title","offer_id":46162968183012,"sku":"4003","price":85.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0726\/8528\/9700\/files\/Gray-Crushed-Rock-1.5-Inch.png?v=1743017119","url":"https:\/\/ottrsupply.com\/products\/gray-granite-1-5","provider":"Ottr Landscape Supply","version":"1.0","type":"link"}