{"product_id":"3x4-no-2-better-heat-treated-s4s-fir-dimensional-lumber","title":"3\" x 4\" #2 \u0026 Better Heat Treated S4S Fir Dimensional Lumber","description":"\u003cstyle\u003e\n.pb-wrap{--pb-line:#e1e3e5;--pb-head:#f6f6f7;max-width:100%}\n.pb-wrap .pb-intro{margin-bottom:20px}\n.pb-acc{border:1px solid var(--pb-line);border-radius:8px;margin:0 0 8px;overflow:hidden}\n.pb-acc\u003esummary{cursor:pointer;padding:14px 16px;font-weight:600;line-height:1.35;\n list-style:none;display:flex;justify-content:space-between;align-items:center;gap:12px}\n.pb-acc\u003esummary::-webkit-details-marker{display:none}\n.pb-acc\u003esummary::marker{content:\"\"}\n.pb-acc\u003esummary::after{content:\"+\";font-size:22px;font-weight:400;line-height:1;flex:0 0 auto}\n.pb-acc[open]\u003esummary::after{content:\"\\2212\"}\n.pb-acc[open]\u003esummary{border-bottom:1px solid var(--pb-line);background:var(--pb-head)}\n.pb-acc\u003esummary:hover{background:var(--pb-head)}\n.pb-acc .pb-body{padding:16px}\n.pb-acc .pb-body\u003e:first-child{margin-top:0}\n.pb-acc .pb-body\u003e:last-child{margin-bottom:0}\n.pb-q{border:0;border-bottom:1px solid var(--pb-line);border-radius:0;margin:0}\n.pb-q:last-child{border-bottom:0}\n.pb-q\u003esummary{padding:12px 0;font-weight:600}\n.pb-q[open]\u003esummary{background:transparent;border-bottom:0}\n.pb-q\u003esummary:hover{background:transparent;text-decoration:underline}\n.pb-q .pb-body{padding:0 0 12px}\n.pb-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}\n.pb-table{width:100%;border-collapse:collapse;font-size:14px;min-width:380px}\n.pb-table th,.pb-table td{border:1px solid var(--pb-line);padding:8px 10px;\n text-align:left;vertical-align:top}\n.pb-table thead th{background:var(--pb-head)}\n.pb-table caption{caption-side:top;text-align:left;font-weight:600;padding:0 0 8px}\n.pb-note{font-size:13px;opacity:.75;margin-top:16px}\n.pb-wrap a{color:#3b82f6}\n.pb-wrap a:hover{color:#2563eb}\n\u003c\/style\u003e\u003cdiv class=\"pb-wrap\"\u003e\n\u003ch2\u003e3\" x 4\" #2 \u0026amp; Better Heat Treated S4S Fir Dimensional Lumber\u003c\/h2\u003e\n\u003cdiv class=\"pb-intro\"\u003e\n\u003cp\u003eThis is a 3x4 in No. 2 \u0026amp; Better fir, heat treated (HT) and surfaced smooth on all four sides (S4S). It is a heavier section than a 2x4, sold in 8, 10 and 12 ft lengths.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe finished size is not published for this stock.\u003c\/strong\u003e Surfaced 3x4 is milled slightly under its nominal size and the exact dimensions depend on the mill and on moisture content. Contact us if a specific thickness or width matters for your layout. For standard 2x4 framing, see our \u003ca href=\"https:\/\/griffbuildingsupplies.com\/products\/2x4x8-fir-dimensional-lumber\" target=\"_blank\" rel=\"noopener\"\u003e2 x 4 #2 Grade Fir Dimensional Lumber\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdetails class=\"pb-acc\"\u003e\u003csummary\u003eFeatures and Common Uses\u003c\/summary\u003e\u003cdiv class=\"pb-body\"\u003e\n\u003cul\u003e\n\u003cli\u003eNo. 2 \u0026amp; Better grade fir, a general framing grade with sound knots and good strength for its size\u003c\/li\u003e\n\u003cli\u003eHeat treated (HT), so the board has been heated through its core to a set temperature and time\u003c\/li\u003e\n\u003cli\u003eSurfaced on four sides for smooth faces and square edges\u003c\/li\u003e\n\u003cli\u003eA 3 in. nominal thickness gives more stiffness and screw-holding depth than a 2x4\u003c\/li\u003e\n\u003cli\u003eNot pressure treated, so it is for dry, above-ground use\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCommonly used for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHeavy blocking, bracing and headers in light framing\u003c\/li\u003e\n\u003cli\u003eSill plates, bench frames and shop or garage framing\u003c\/li\u003e\n\u003cli\u003ePost and rail work in dry, covered structures\u003c\/li\u003e\n\u003cli\u003ePallet, crate and equipment frames\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\u003c\/details\u003e\u003cdetails class=\"pb-acc\"\u003e\u003csummary\u003eSpecifications\u003c\/summary\u003e\u003cdiv class=\"pb-body\"\u003e\n\u003cdiv class=\"pb-scroll\"\u003e\u003ctable class=\"pb-table\"\u003e\n\u003ccaption\u003eProduct Specifications\u003c\/caption\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eProduct\u003c\/th\u003e\n\u003ctd\u003e3x4 No. 2 \u0026amp; Better Fir, HT, S4S\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eSpecies\u003c\/th\u003e\n\u003ctd\u003eFir\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eGrade\u003c\/th\u003e\n\u003ctd\u003eNo. 2 \u0026amp; Better\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eNominal size\u003c\/th\u003e\n\u003ctd\u003e3 in. x 4 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eAvailable lengths\u003c\/th\u003e\n\u003ctd\u003e8, 10 and 12 ft\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eHeat treatment\u003c\/th\u003e\n\u003ctd\u003eHT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eSurfacing\u003c\/th\u003e\n\u003ctd\u003eS4S, surfaced on four sides\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003ePressure treated\u003c\/th\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003cp class=\"pb-note\"\u003eGrade, species and heat-treatment marks are stamped on each board and are the governing record for the piece you receive. Finished dimensions and moisture content are set by the mill and can vary, so confirm them at the counter if your project depends on them.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/details\u003e\u003cdetails class=\"pb-acc\"\u003e\u003csummary\u003eFrequently Asked Questions\u003c\/summary\u003e\u003cdiv class=\"pb-body\"\u003e\n\u003cdetails class=\"pb-acc pb-q\"\u003e\u003csummary\u003eWhat does HT mean on lumber?\u003c\/summary\u003e\u003cdiv class=\"pb-body\"\u003e\u003cp\u003eHT means heat treated. The wood is heated to a core temperature of at least 56 C for a minimum of 30 minutes under the ISPM 15 standard. It is a heat process, not a chemical preservative.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003cdetails class=\"pb-acc pb-q\"\u003e\u003csummary\u003eWhat does No. 2 and Better mean?\u003c\/summary\u003e\u003cdiv class=\"pb-body\"\u003e\u003cp\u003eIt is a visual grade for framing lumber. No. 2 and Better boards are sound for general structural use and can include higher grades above No. 2, so you get a consistent, reliable board.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003cdetails class=\"pb-acc pb-q\"\u003e\u003csummary\u003eWhat is the actual size of a 3x4?\u003c\/summary\u003e\u003cdiv class=\"pb-body\"\u003e\u003cp\u003eA surfaced 3x4 is planed smaller than its nominal 3 in. x 4 in. name, and the exact size depends on the mill. Contact us if you need a specific thickness and width confirmed.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003cdetails class=\"pb-acc pb-q\"\u003e\u003csummary\u003eIs a 3x4 the same as a 2x4?\u003c\/summary\u003e\u003cdiv class=\"pb-body\"\u003e\u003cp\u003eNo. A 3x4 is thicker, so it is stiffer and heavier and is not interchangeable with a 2x4 in a wall or framing plan. Check your drawings before you substitute one for the other.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003cdetails class=\"pb-acc pb-q\"\u003e\u003csummary\u003eCan I use it outside?\u003c\/summary\u003e\u003cdiv class=\"pb-body\"\u003e\u003cp\u003eOnly where it stays dry and above ground. It is not pressure treated, so it is not suited to ground contact or constant wet. Choose pressure treated lumber for those jobs.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003c\/div\u003e\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Product\",\"@id\":\"https:\/\/griffbuildingsupplies.com\/products\/3x4-no-2-better-heat-treated-s4s-fir-dimensional-lumber#product\",\"name\":\"3\\\" x 4\\\" #2 \u0026 Better Heat Treated S4S Fir Dimensional Lumber\",\"url\":\"https:\/\/griffbuildingsupplies.com\/products\/3x4-no-2-better-heat-treated-s4s-fir-dimensional-lumber\",\"brand\":{\"@type\":\"Brand\",\"name\":\"Griff\"},\"category\":\"Hardware \u003e Building Materials \u003e Lumber \u0026 Sheet Stock\",\"description\":\"3x4 No. 2 \u0026 Better fir lumber, heat treated and surfaced on four sides. 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