What are concrete tolerances?
What are concrete tolerances?
Tolerances are a means to establish permissible variation in dimension and location, giving both the designer and the contractor limits within which the work is to be performed.
What is the tolerance of a concrete slab?
Traditionally allowable tolerances of concrete floor slabs were determined by checking the slab surface with a 10 foot straightedge. Common tolerances were 1/8 inch or 1/4 inch in 10 feet.
What is ACI 117?
Specification synopsis: This specification provides standard tolerances for concrete construction and materials. This document is intended to be used by specification writers and ACI committees writing standards as the reference document for establishing tolerances for concrete construction and materials.
What is construction tolerance?
Tolerances in construction are generally a variation in a dimension, construction limit, or physical char- acteristic of a material. They are a practical variation related to the function of the material or finished work and commonly accepted standards of the construction industry.
What do FF and FL Numbers mean?
floor flatness
When it comes to concrete slab construction, F-Numbers are the metric for quality. They consist of the concrete floor flatness (FF) and floor levelness (FL). Higher F-numbers equal flatter floors. Floor Levelness (FL): The FL number indicates if you have any tilts or pitches in the slab.
What is Class 3 concrete finish?
A Class 3 finish will give a good visual quality when the project is viewed as a whole. Classes 4 and 5 are for situations where the visual quality is not important and apply to surfaces which are concealed from general view or are never seen.
What is acceptable variation in the foundation?
Foundations walls should be level within 1/4 inch in 10 feet, while the entire foundation should be level within 1/2 inch. The Handbook states that there is no single accepted tolerance for rough framing, although a tolerance of 1/4 inch in 10 feet is frequently used and is acceptable.
What are tolerances in construction?
Some items may have very little scope for variance if a building is to be constructed or perform as required, while other items will still work well within wider limits. This is why an allowable deviation, or ‘tolerance’, may be allowed or specified that is not considered to be a defect.
What are ACI 117 tolerances?
As the title “Specifications for Tolerances for Concrete Construction and Materials (ACI 117)” implies, the tolerances given are standard or usual tolerances that apply to various types and uses of concrete construction. They are based on normal needs and common construction techniques and practices.
What is ACI tolerance in concrete construction?
ACI Tolerances for Concrete Construction. The maximum deviation is defined for the plumbness of walls, columns, and openings. Maximum deviation is defined for horizontal and vertical faces. The tolerance, for example, on the distance between different structural elements, for example, a wall and a column, is ±¼ inch.
Where can I find the ACI Manual of concrete practice (MCP)?
Most ACI standards and committee reports are gathered together in the annually revised ACI Manual of Concrete Practice (MCP). American Concrete Institute 38800 Country Club Drive Farmington Hills, MI 48331 U.S.A. Phone: 248-848-3700 Fax: 248-848-3701 www.concrete.org ISBN 978-0-87031-379-0 ACI 117-10
What is the American Concrete Institute’s policy on liability?
The American Concrete Institute disclaims any and all responsibility for the stated principles. The Institute shall not be liable for any loss or damage arising therefrom. Reference to this document shall not be made in contract documents.
