Stone retaining wall contractor, RL Sanborn Masonry, is a  
    located in Portland Maine and provides professional stone
    retaining wall construction, restoration and repair services
    throughout Cumberland County Maine.

    Many material options exist for stone retaining walls and are provided by
    local stone suppliers.
    You may  choose  from variations of stone, brick, concrete block or
    poured concrete.  Stone retaining walls may be set with mortar or dry laid
    depending on  preference.

    Our retaining walls are built with proper stone or concrete footings, that are
    reinforced with steel and installed below the frost line, to prevent shifting
    and cracking.

    Would you like a free retaining wall consultation and free retaining wall
    estimate? (click here) or Call  (207)619-7473

    What is a retaining wall?
    A retaining wall Is a structure that holds back soil or rock from a building, structure or area. Retaining walls prevent downslope movement or erosion and provide support For
    vertical or near-vertical grade changes.

    Cofferdams and bulkheads,
    structures that hold back water, are sometimes also considered retaining walls.

    Retaining walls are generally made of masonry, stone, brick, concrete, vinyl, steel or timber. Once popular as an inexpensive retaining material, railroad ties have fallen out of
    favor due to environmental concerns.

    Segmental retaining walls have gained favor over poured-in-place concrete walls or treated-timber walls. They are more economical, easier to install and more
    environmentally sound.

    The most important consideration in proper design and installation of retaining walls is that the retained material is attempting to move forward and downslope due to gravity.
    This creates lateral earth pressure behind the wall which depends on the angle of internal friction (phi) and the cohesive strength of the retained material, as well as the
    direction and magnitude of movement the retaining structure undergoes.

    Lateral earth pressures are typically smallest at the top of the wall and increase toward the bottom. Earth pressures will push the wall forward or overturn it if not properly
    addressed. Also, any groundwater behind the wall that is not dissipated by a drainage system causes an additional horizontal hydrostatic pressure on the wall.

    As an example, the International Building Code requires retaining walls to be designed to ensure stability against overturning, sliding, excessive foundation pressure and
    water uplift; and that they be designed For a safety factor of 1.5 against lateral sliding and overturning


    Gravity walls depend on the weight of their mass
    (stone, concrete or other heavy material) to resist
    pressures from behind and will often have a slight
    'batter' setback, to improve stability by leaning back
    into the retained soil. For short landscaping walls, they
    are often made from mortar less stone or segmental
    concrete units (masonry units). Dry-stacked gravity
    walls are somewhat flexible and do not require a rigid
    footing in frost areas.

    Earlier in the 20th century, taller retaining walls were
    often gravity walls made from large masses of concrete
    or stone. Today, taller retaining walls are increasingly
    built as composite gravity walls such as: ego synthetic
    or with pre cast facing; gabions (stacked steel wire
    baskets filled with rocks); crib walls (cells built up log
    cabin style from pre cast concrete or timber and filled
    with soil); or soil-nailed walls (soil reinforced in place
    with steel and concrete rods).


    Prior to the introduction of modern reinforced-
    soil gravity walls, cantilevered walls were the
    most common type of taller retaining wall.
    Cantilevered walls are made from a relatively
    thin stem of steel-reinforced, cast-in-place
    concrete or mortared masonry (often in the
    shape of an inverted T). These walls cantilever
    loads (like a beam) to a large, structural
    footing, converting horizontal pressures from
    behind the wall to vertical pressures on the
    ground below. Sometimes cantilevered walls
    are buttressed on the front, or include a
    counter fort on the back, to improve their
    stability against high loads. Buttresses are
    short wing walls at right angles to the main
    trend of the wall. These walls require rigid
    concrete footings below seasonal frost depth.
    This type of wall uses much less material than
    a traditional gravity wall.

    See also: Tieback (geo
    This version of wall uses cables
    or other stays anchored in the
    rock or soil behind it. Usually
    driven into the material with
    boring, anchors are then
    expanded at the end of the
    cable, either by mechanical
    means or often by injecting
    pressurized concrete, which
    expands to form a bulb in the
    soil. Technically complex, this
    method is very useful where
    high loads are expected, or
    where the wall itself has to be
    slender and would otherwise be
    too weak.

    Types Of Retaining Walls

What is masonry?

Masonry is the building
of structures from
individual units laid in
and bound together by
mortar. The common
materials of masonry
construction are brick,
stone such as marble,
granite, travertine,
limestone; concrete
block, glass block, and
tile. Masonry is
generally a highly
durable form of
construction. However,
the materials used, the
quality of the mortar and
workmanship, and the
pattern the units are put
in can strongly affect the
durability of the overall
masonry construction
RL Sanborn Masonry 2014
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Portland Maine masonry contractor,RL Sanborn Masonry. Professional masonry construction,restoration and repair including; buildings, fireplaces, chimneys,stairs,walkways and more.
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